A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

A brothel nestled amongst ghost towns, with an abandoned plane wreck to greet you.

Odd outsider art installations surround a Gold Rush-era ghost town.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The world’s largest concentrated solar plant generates as many problems as megawatts.

Crumbling remnants of what was once a booming town full of silver.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

A 19th-century Baja cantina that many say is the birthplace of the margarita.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Meet manatees face-to-face at this zoo for native species.

A building so large that it has its own weather.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The most confusing clock in New York.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The "lovely red Vega" of the legendary record-settling pilot.

The largest island on the great salt lake is home to curious creatures and strange stories.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.