An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A psychedelic labyrinth on the San Francisco bay.

Quite simply the largest tree in the world (by volume).

Four hundred granite steps were built into this massive rock by the National Park Service.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

This garden located inside a bamboo forest once belonged to a famous Japanese actor.

The longest spit in the United States ends at a lighthouse in the Strait of Juan de Fuca.

Enjoy dishes that founding fathers once ate at this Colonial Williamsburg pub.

The longest step street in the city.

This pub boasts a curious history and may have inspired a Dickens character.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

An institution dedicated to the towering buildings that make up skylines in New York City and around the world.

Built in the 1920s, this co-op in the Bronx feels more like an Italian villa than a typical New York apartment building.

The oldest private residence in New York City.

The only subway station in the city that still makes use of gap fillers.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The land is home to swimming ponies and a legendary 18th-century treasure.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.