Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

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

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The prototype for all Nazi concentration camps.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

A hidden three-foot-wide house separates these two regal churches.

Elaborate tile work in this railway station tells the story of Portugal.

Ancient catacombs form the foundation for this Rococo orgy of a church.

This abandoned five-star hotel is now a five-star urban exploration destination.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The stunning interior of this Gothic church is covered in ornate gold details.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

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

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

The corpse bride of Portugal.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

Water and windows define this defensive Italian well.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This Italian ski resort rose to fame when Benito Mussolini was held prisoner there and then rescued by the SS.