Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A hotel and restaurant serving as the mecca of kitsch.

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

This shop specializes in oddities and Victorian-inspired wonders.

Resting place of Hollywood's immortals is also site of summer film screenings.

Medical and zoological curiosities for sale.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A psychedelic labyrinth on the San Francisco bay.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

A well-worn marker in a forgotten alleyway is all that remains of what had been one of Manhattan's most beautiful buildings.

The home of the first American-born saint is one of the only curved buildings in New York.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

Bridges, terraces, and replicas of historic structures all built of rock and petrified wood by one man.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A stellar example of Art & Crafts architecture, and a movie set to boot.

A forensic lab dedicated to fighting crimes against wildlife.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The United States Capitol's former columns still stand.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Reforestation in action is the main attraction in this abandoned quarry.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

A crumbling hospital from the 1850s on Roosevelt Island.

Once America's longest-manned military fort, now an abandoned hulk.