This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A former major munitions plant that has been converted into a sprawling art space.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Famously misunderstood wonder of the ancient world

The oldest working mechanical clock in the world.

A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the "fairy-tale king."

The prototype for all Nazi concentration camps.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

These bronze sculptures sow whimsy by hamming it up on a pedestrian mall.

Come for the flowers, stay for the bats!

The platform atop this verdant volcano was built with the help of a royal elephant.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

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

New Zealand's only running funicular railway.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

High winds can make this one scary landing.

The location of this historic castle was inspired by a donkey.

Where the sleeping monsters of Scotland's oil industry are left to rust.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.