This old cement mine has been used as everything from a mushroom farm to a recording studio.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Sniff the Titan Arum's rotting flesh.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

New York City's only radical feminist independent bookstore.

Become a prohibition rebel.

A hands-off space for graffiti artists to hone and display their skills.

The pockmarks across the building's facade are remnants of the Blitz.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

A legend says that if this elaborately decorated glass breaks, the good fortune of its owner's household will also disappear.

The medieval woodcut-style artwork chronicles life in medieval London.

Be on the lookout for the symbolic insect all over the city.

A 19th-century time capsule of travel, fiction, and historic texts still available to the public.

Its collection includes a broad array of social, geographic, graphic design, and political history.

This ancient Egyptian obelisk still bears the wounds of World War I.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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