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Mount Defiance is an 840 ft (260 m) high hill on the New York side of Lake Champlain, in the northeastern United States. It is notable in that the hill militarily dominates both Fort Ticonderoga and Mount Independence, but it was deemed inaccessible so never fortified. Mount Defiance was previously known as Sugar Loaf. In the 1777 Siege of Fort Ticonderoga, the British army succeeded in positioning artillery on Mount Defiance, causing the Continental Army to withdraw from both forts without a fight. Mount Defiance is located in the town of Ticonderoga in southeastern Essex County.

The La Chute River, also known as Ticonderoga Creek, is a short, fast-moving river, near the Vermont–New York border. It is now almost wholly contained within the municipality of Ticonderoga, New York, connecting the northern end and outlet of the 32-mile (51 km) long Lake George and the southern end of the 107-mile (172 km) long Lake Champlain through many falls and rapids. The river drops about 230 feet (70 m) in its three and a half-mile (6 km) course, which is a larger drop than Niagara Falls (167 ft (52 m)). Part of the Lake Champlain Valley and the St. Lawrence River drainage basin, ultimately its waters flow out of Lake Champlain through the 106 miles (171 km) length of the Richelieu River into the St. Lawrence River and then into the North Atlantic Ocean north of Nova Scotia.

The Ferris House is a historic house located at 16 Carillon Road in Ticonderoga, Essex County, New York.

Central School was a historic school building located at Ticonderoga in Essex County, New York. It was built in 1906 and was a 2+1⁄2-story, eleven-bay-wide by seven-bay-deep brick building with Jacobean Revival style features. The features included parapeted gables, round arched entrances, and a steeply pitched multi-gabled roof. A rear 1+1⁄2-story addition had a slate hipped roof. It was built on the site of the Academy, Ticonderoga's first high school. It was used as a school until 1967; from 1967 to 1984 it was used as a civic center for community activities. It was listed on the National Register of Historic Places in 1988, and was demolished in 2001.

The Battle of Ticonderoga was a minor confrontation at Fort Carillon (later renamed Fort Ticonderoga) on July 26 and 27, 1759, during the French and Indian War. A British military force of more than 11,000 men under the command of General Sir Jeffery Amherst moved artillery to high ground overlooking the fort, which was defended by a garrison of 400 Frenchmen under the command of Brigadier General François-Charles de Bourlamaque. Rather than defend the fort, de Bourlamaque, operating under instructions from General Louis-Joseph de Montcalm and New France's governor, the Marquis de Vaudreuil, withdrew his forces, and attempted to blow up the fort. The fort's powder magazine was destroyed, but its walls were not severely damaged. The British then occupied the fort, which was afterwards known by the name Fort Ticonderoga. They embarked on a series of improvements to the area and began construction of a fleet to conduct military operations on Lake Champlain. The French tactics were sufficient to prevent Amherst's army from joining James Wolfe at the Battle of the Plains of Abraham. However, they also tied up 3,000 of their own troops that were not able to assist in Quebec's defense. The capture of the fort, which had previously repulsed a large British army a year earlier, contributed to what the British called the "Annus Mirabilis" of 1759.

The siege of Fort Ticonderoga occurred between 2 July and 6 July 1777 at Fort Ticonderoga, near the southern end of Lake Champlain in the state of New York. Lieutenant General John Burgoyne's 8,000-man army occupied high ground above the fort, and nearly surrounded the defenses. These movements precipitated the occupying Continental Army, an under-strength force of 3,000 under the command of General Arthur St. Clair, to withdraw from Ticonderoga and the surrounding defenses. Some gunfire was exchanged, and there were some casualties, but there was no formal siege and no pitched battle. Burgoyne's army occupied Fort Ticonderoga and Mount Independence, the extensive fortifications on the Vermont side of the lake, without opposition on 6 July. Advance units pursued the retreating Americans. The uncontested surrender of Ticonderoga caused an uproar in the American public and in its military circles, as Ticonderoga was widely believed to be virtually impregnable, and a vital point of defense. General St. Clair and his superior, General Philip Schuyler, were vilified by Congress. Both were eventually exonerated in courts martial, but their careers were adversely affected. Schuyler had already lost his command to Horatio Gates by the time of the court martial, and St. Clair held no more field commands for the remainder of the war.

The capture of Fort Ticonderoga occurred during the American Revolutionary War on May 10, 1775, when a small force of Green Mountain Boys led by Ethan Allen and Colonel Benedict Arnold surprised and captured the fort's small British garrison. The cannons and other armaments at Fort Ticonderoga were later transported to Boston by Colonel Henry Knox in the noble train of artillery and used to fortify Dorchester Heights and break the standoff at the siege of Boston. Capture of the fort marked the beginning of offensive action taken by the Americans against the British. After seizing Ticonderoga, a small detachment captured the nearby Fort Crown Point on May 11. Seven days later, Arnold and 50 men raided Fort Saint-Jean on the Richelieu River in southern Quebec, seizing military supplies, cannons, and the largest military vessel on Lake Champlain. Although the scope of this military action was relatively minor, it had significant strategic importance. It impeded communication between northern and southern units of the British Army, and gave the nascent Continental Army a staging ground for the invasion of Quebec later in 1775. It also involved two larger-than-life personalities in Allen and Arnold, each of whom sought to gain as much credit and honor as possible for these events. Most significantly, in an effort led by Henry Knox, artillery from Ticonderoga was dragged across Massachusetts to the heights commanding Boston Harbor, forcing the British to withdraw from that city.

The NYS Armory is a historic former National Guard armory building located at Ticonderoga in Essex County, New York. It was built in 1934–1935 and is a large, two story T-shaped brick and case stone building with Tudor and Jacobean Revival style features. The main seven bay block has a steeply pitched, slate-covered hipped roof and is flanked by two bay wings. It was listed on the National Register of Historic Places in 1988. The building now serves as a local community center.

Ticonderoga Pulp and Paper Company Office is a historic office building located at Ticonderoga in Essex County, New York. It was built in 1888 and is a rectangular, two story structure of brick laid in common bond with a rectangular brick addition built about 1910. Both sections have gray slate gable roofs, white painted wood trim, and a denticulated brick cornice. The company was organized in 1877 by Clayton H. Delano, whose house is also listed on the register. It was listed on the National Register of Historic Places in 1988. The building now houses the Ticonderoga Heritage Museum which share the industrial heritage of the area with visitors. It is also the visitors information center for the town.

H. G. Burleigh House is a historic home located at Ticonderoga in Essex County, New York. The home was originally owned by U.S. Congressman Henry G. Burleigh, and was built in 1894 and enlarged in 1905. It is a 2+1⁄2-story, irregularly massed stone and concrete veneer Queen Anne–style building with Colonial Revival features. It is a 2+1⁄2-story, rectangular, gable-roofed structure built of brick. It features a central Palladian window at the second level. It features complex massing, molded chimneys, multiple roofs, corner towers, as well as classical columned and shingle-sheathed porches. It was listed on the National Register of Historic Places in 1988.

Amherst Avenue Historic District is a national historic district located at Ticonderoga, in Essex County, New York. The district contains 16 contributing buildings on ten properties; 10 houses and six garages. It includes single-family homes built between 1921 and 1923 by W.A. Gale for the Ticonderoga Pulp and Paper Company as rental properties for company management. Gale also constructed the houses in the Lake George Avenue Historic District. It was listed on the National Register of Historic Places in 1989.

Ticonderoga High School is a historic high school building located at Ticonderoga in Essex County, New York. It was built in 1928-1930 and is a three-story, masonry neo-Georgian style building with a slate roof, concrete foundation, and brick walls. It features a semi-circular portico with Corinthian order columns and a balustrade and a copper polygonal cupola. It was listed on the National Register of Historic Places in 1988. As of 2021, the building is still in use as the sole public high school operated by the Ticonderoga Central School District.