This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Atop this former dutch railway office sits an interstellar work of art.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

The location of the world's first telescope demonstration.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.

Bacteria and algae give the salty water its bubblegum hue.

The world's most active stratovolcano is almost always erupting.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This is the oldest Roman-made bridge in the city still existing in its original state.

The world's largest frame offers spectacular views of the city's past and present.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

A lush oasis full of vibrant plants and striking geometric displays.

A shrine-like museum entirely dedicated to soccer superstar Cristiano Ronaldo.

The former home of Dutch anthropologist Bert Flint now houses a collection of Berber art and artifacts.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.