Which Paris landmark is the tallest explorable structure in Assassin's Creed Unity?

Notre-Dame Cathedral is the tallest explorable structure in Assassin's Creed Unity.

Unity is set in Paris during the French Revolution and lets protagonist Arno Dorian explore a detailed recreation of the city. Notre-Dame Cathedral is one of the game's major landmarks and can be climbed and entered as part of the parkour-focused environment.

The game launched in 2014 and includes districts, interiors, crowds, and historical buildings designed around late-eighteenth-century Paris. Notre-Dame's prominent height makes it an important navigation point, while its architecture provides one of the series' most recognizable climbing locations.

The Eiffel Tower is a tempting answer, but it was not completed until 1889, long after Unity's revolutionary setting. The Arc de Triomphe was also built later, with construction beginning under Napoleon in 1806. The Louvre existed in the period, but it is not Unity's tallest explorable structure.