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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

The private clubhouse for the members of the Academy of Magical Arts.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

This California tree is the single source of the state's entire orange industry.

A "haunted" landmark on the coast of Southern California.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

A walk through the historic city center, under the streets of Seattle.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Outsider art meets paleontology at this roadside reptile repository.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This pun was simply waiting to come to life, and one defense contractor made it so.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

These unusual rooms on wheels are holdovers from the 1960s.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

A former major munitions plant that has been converted into a sprawling art space.