A mysterious find dredged from Louisiana waters.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A unique exhibit lets blind people experience famous works of art and architecture with their hands.

This influential Renaissance-era library was once the haunt of kings and monks.

You can soak in three relaxing pools filled daily by the tide.

148 feet long and in the middle of a verdant forest.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A faux European lane smack dab in downtown L.A.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The trials and tribulations of marking Poe's grave.

Quite simply the largest tree in the world (by volume).

Seattle's own bad art museum located inside Cafe Racer.

The magic's in the hole!

A museum dedicated to the alleged Roswell Incident.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.