This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This colorful statue welcomes visitors to a Barcelona park.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

An early 20th-century bullring converted into a modern shopping center.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A public display of prehistoric space rocks is named for the Namibian village where they were found.

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

This now abandoned restaurant provides some of the most amazing views of Lisboa.

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

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

Abandoned ships along a deserted beach feel like the set of a post-apocalyptic thriller.

The unexpectedly beloved remnants of a controversial thermal power plant.

The final resting place of the great navigator, or maybe his brother.

Legend has it this spring formed at the spot where a medieval Swedish king was killed.

A large collection of ancient runestones decorates this university courtyard.

Legend says this fabled well held part of a mythical Norse tree.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

The official meeting point for the oddly named governing assembly of ancient Sweden.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

Eat a Nobel banquet from any year in the basement of Stockholm's City Hall.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

The reason for the strange contortions in the trunks of these "drunken" pine trees in Russia is still a mystery.

A small part of Russia that does not touch any other part of Russia.