A statue of Paulina Hermann, the eccentric noblewoman known as the "mother of cats."

Abstract monuments express sorrow and resilience at the site of a horrific massacre in Nazi-occupied Serbia.

A surreal monument depicting a five-armed giant supporting a toppling cylinder seal.

A strange aquarium with stuffed fish, and almost no water for them to swim in.

A huge museum of much more than just agriculture displayed in a princess's palace.

The most alien-looking place on Earth.

One of the most remote and isolated villages on the Arabian Peninsula.

A mesmerizing reservoir nestled at the heart of a pre-Islamic Yemeni village.

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

A nearly abandoned Jewish settlement perched atop a hill in the heart of Yemen.

Elaborate patterns adorn the city's disappearing traditional architecture.

One of Yemen’s oldest and most beautiful mosques was named for the incredible, historical queen buried inside it.

This impressive system of tanks was used to store drinking water as long as 2,000 years ago.

The remains of a Zoroastrian temple that bore witness to a time when Aden was a flourishing trading hub.

The tallest minaret in Yemen is 150 feet high and entirely made of mud.

One of the largest mud-brick structures in the world.

A city built from mud and known as the "Manhattan of the desert."

This ancient Roman aqueduct once funneled water to Diocletian's palace.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

Split's smallest church, and one of its oldest, has been reconstructed inside the city's Roman walls.

This heart-shaped island looks substantially less lovely after a recent bulldozing project.

The “world’s smallest cathedral” is a remnant of one of Croatia’s medieval royal towns.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.