The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Visit the WWII bunker where the British won the battle for the skies.

This former luxury resort in Kaua'i is now an abandoned relic.

Burial site more than 300 years old.

A maritime museum holding the remains of Blackbeard's pirate ship.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

This North Carolina grave is the final resting place of the world's most famous conjoined twins.

Jule Körner's house full of bizarre architectural details.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

A former Confederate hospital serves as a remembrance of wounded and dead soldiers.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The oldest working mechanical clock in the world.

Formerly the most gerrymandered district in the U.S., it twisted and turned along racial borders.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This replica of the Greek structure is in the heart of Nashville.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The highest point in Virginia can only be reached by passing through ponies and flowers.

Virgil's many-mouthed gateway to the underworld.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

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

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.