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.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Tubing through a cave lit with glowworms is a magical underground experience.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The only pollutant in the clear blue water is sunscreen.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Famously misunderstood wonder of the ancient world

A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

Pompeii's less famous neighbor is still revealing her secrets.

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.