A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

This was one of the first (and last) university-built and operated nuclear reactors.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A popular European tradition makes its way to the states on one of America's most famous bridges.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

A bit of retro transportation flair preserved in the world's largest department store.