The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

This one-time health resort was used by aristocrats around the world.

Baroque celebration of the end of the Great Plague of Vienna.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Macabre astrological automaton clock dating to the late 1400s.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

Marvel at the excessive luxury of the ousted Ukrainian president's former estate.

In addition to showing films, this one-screen arthouse cinema from the late 1940s is a museum of old film equipment.

After the owner of this Art Nouveau home died, it was turned into a museum displaying a lifetime dedicated to art.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

One of the smallest bookstores on the planet.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The world's oldest bookshop still in operation.

This crumbling Portuguese ruin overlooks the populace it once ruled.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

Abandoned since the 1950s, the streetcar lane beneath the heavily trafficked bridge lays empty and unused.

An abandoned textile mill that is now home to art and concerts.