London's old-school healing garden.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

The world's largest frame offers spectacular views of the city's past and present.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

Billed as the "largest natural flower garden in the world" this Middle Eastern show field has little competition at 45 million flowers.

This artificial archipelago was supposed to resemble a map of the world.

This indoor ski resort has a mountain contained inside a mall.

A faithful reproduction of Al-Jazari's enormous water clock.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

New York City's smallest piece of private property.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Read a book next to a Midtown waterfall.

A hip bar decorated with walls of golden skulls.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

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

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Tucked in the back of this amazing antique store is an important piece of medical history.