The attic of a four-century-old canal house hides a clandestine church.

This hidden courtyard in the Andorran capital hosts a unique contemporary sculpture park.

The oldest operating roller coaster of its kind, the Montaña Suiza has been thrilling riders since 1928.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

This one-time health resort was used by aristocrats around the world.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

This 135-year-old weather station studied the effects of the climate on human health.

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

According to a local legend, this old castle could only be built after a woman was immured in the walls.

A 11-foot former president stands on a Kosovo street that also bears his name.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

Huge stairway leads to this massive gallery.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

With over 10,000 lights, this engineering marvel lights up the city after dark.

The world's tallest statue of a woman wields the world's tallest sword and is at risk of toppling over.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

A shrine of fire worship built on top of a natural flame.