One of only two commuter aerial tramways in the United States.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

Become a prohibition rebel.

An ancient Egyptian temple in the middle of Madrid, Spain.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

The curios of pharmacist and collector Henry Wellcome.

A kaleidoscopic warehouse-maze of handmade neon signs.

Catacombs turned marketplace.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

The remains of the great moral philosopher reside in a university in London.

The morbid items in this small and hidden museum are not for the weak stomached.

The earliest known map to show America, discovered by accident at a Paris bookshop.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Eighty million natural history specimens call this gargantuan museum home.

Banksy gives themself artistic license with this piece of London street art.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

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

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.