The scant remains of an expansive indigenous civilization can be seen at this Arkansas state park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

9,000 square feet of vintage and modern mechanical toys, dioramas & sideshow curiosities.

A pier that used to act as a busy ferry dock is now a decaying favorite of local fisherman and urban artists.

Playable, historic pinball machines fill this Alameda museum.

When ecosystems collide in the arid Southwest.

The largest self-built castle in the U.S., six decades in the making.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

A house of courtship where the Jazz Age's most storied lovers got their start.

Site of a former hidden treehouse in New Orleans.

The greatest collection of New Orleans masking and processional traditions covering everything from Baby Dolls to Skull and Bone gangs.

A snapshot of the city's fascinating voodoo culture.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

The final resting place of New Orleans' most famous voodoo priestess.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

Large pioneer village showcasing life during boom times.

Vikings and Evangelicals have both had a hand in this replica medieval church.