Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Elevated freight railway turned wildly successful urban park.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

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

An enormous, inside-out glass globe built in 1935.

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

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.