An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

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

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A moving memorial to the fallen and missing from WWI trenches.

This memorial museum chronicles the apocalyptic destruction of the First World War.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

This lovely pocket park is one of the most under appreciated in D.C.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

Rumors of the occult haunt this upscale 1920s hotel.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A kaleidoscopic warehouse-maze of handmade neon signs.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."