The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

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

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

A popular swimming hole that hides one of America's most deadly diving spots.

A mysterious castle built as a monument to lost love.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.