A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

The first spinning jail built in the United States is the only one that still turns.

This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

A subterranean haunt where wine and homemade biscottis are always on the menu.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A priceless work of art created by the saint's own blood sister hangs in a San Antonio basilica.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

Ruins of a once-opulent grand Victorian resort.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

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

This painted Lego bridge is the product of over a century of locomotive history.

This "floating railway" is one of the world's oldest monorail systems.

An abandoned mine where dreams of quicksilver trickled away over 75 years ago.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Ghost town with a beer-drinking goat for mayor.

The only international border marker within the United States.

A Prada store in the West Texas desert that is never open for business.

Mysterious glowing orbs float through the desert night.

The Grand Canyon of Texas.

An emerald-green grotto just a short trip from Austin.