These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A clone of a cloned tree that was so important it allegedly had its own guards.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

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

A painfully obvious spy house sits right across the street from the Russian Embassy.

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

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

For nearly 2,000 years this church has been waging war on local snakes by importing cats.

On Japan's Tashirojima Island, cats are king.

Black cat statues guard this temple-like Egyptian revival factory.

An abandoned Cold War missile radar site.

These lush botanical gardens employ the most purrfect pest control force.

A pair of pure white felines guard the entrance to a spot of California real estate established as an artist's haven.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

This collection of bronze hands comes from astronauts, presidents, baseball greats, and more.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

A hurricane-stricken oak tree has been reborn as a beautiful chainsaw artwork.