The site where Poe “in great distress, and ... in need of immediate assistance” likely died.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

Largest Roman Catholic church in North America.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

The world's longest known cave system.

A tribute to Ponce de Leon's supposed quest for eternal youth.

World's second largest particle accelerator, where nature reveals its secrets.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

"We Seceded Where Others Failed."

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A Memphis park where you can walk the whole Mississippi River in one go.

The perfect place to take a family of giants for a beach vacation.

A building so large that it has its own weather.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A beautiful geyser under environmental threat.

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

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

France's most famous cemetery, with some of its most curious tombs.

Former hotel turned into haunted playground.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

This striking art museum holds an amazing series of curiosity cabinets.