Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The resting place for anonymous victims of the Danube's dark waters.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

This cubist Vienna church building looks like some sort of alien stonehenge.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

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

A devasting 2020 fire left this historic seminary in ruins.

This Gallo-Roman sanctuary is dedicated to Serápis, god of the underworld.

The crumbling ruins of an abandoned 12th-century monastery.

This abandoned fortress still stands guard over the Guadiana River despite a history of warfare.

A glacial valley filled with silver beech trees in the mountains of Portugal.

This enigmatic Roman tower lurks just outside Belmonte.

These rock drawings in the Côa Valley also create an ancient optical illusion.

Panoramic views from the mountains over a facility built to provide tuberculosis patients with fresh mountain air.

This chapel is the site of a yearly pilgrimage that originated during the Middle Ages.

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

This oddly shaped church resembles a rocket.

An 11th-century medieval castle cascades over the town of Numão.

The ancient sauropod tracks found in this former quarry are some of the largest in the world.

A fortress off the West coast of Portugal that dates back to 1502.

An ancient tomb that still stands in Portugal.