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

These temples are among the oldest free-standing stone buildings in the world.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

This subterranean necropolis holds three floors of antler-dug grave caves.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

Austin’s local mountain isn’t really a mountain at all.

This small stone building, the final work of a renowned artist, offers a peaceful environment with radiant, colorful glass windows .

Locals dubbed it the "Owl Building" because of its bird-like appearance.

A high-octane shrine to the greatest Texans who ever lived.

Just like the real 36th president of the United States, animatronic LBJ amuses visitors with jokes and stories.

This massive oak tree has ties to the first native tribes of the region and the founders of Texas.

A free, canine-friendly alternative watering hole near the more famous Barton Springs.

Some islands... they come, they go, especially on Lake Travis.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

The oldest skyscraper of Europe now stands dwarfed by the surrounding structures.

The oldest statue in the Netherlands has survived relocation, bombardment, and burial.

An icon of International Style architecture on the outskirts of Rotterdam.

A bridge that has seen many reiterations over its lifetime.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The only museum with its curator—and her pets—buried inside.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Venice's island of the dead.