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

The final resting place of a space program monolith.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

The largest permanent Monopoly board makes one of the longest games even bigger.

A science teacher's dream.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

Town of spiritualists and mediums in Florida.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

The subtle science of a master molecular gastronomist.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

The only diamond mine in the world where you can keep what you find.

A haunted hill that supposedly defied gravity.

Most famous work of one of Frank Lloyd Wright's sons.

A wondrous old library overlooking the nation's capital.

This grand mansion has starred in everything from Bones to Buffy.

A modern mechanical planetary system, part of a 10,000 year clock.

The Boston square dedicated to the dark poet who was born nearby.

Nikola Tesla's former home contains an homage hidden from plain sight.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.