A historical puzzle lies at the origins of this structure.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

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

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

A temple dedicated to the 13th-century Alevi Turkish dervish credited with bringing Islam to the Balkans.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

Thousands of objects tell the story of a city famous for its tobacco.

Depending on the region's rainfall, this church may be partially submerged.

St. John the Baptist's forearm is housed in this remote 11th-century monastery.

This remote church calls a tiny island its sanctuary.

Decorated with a staggering 1,380 ladybugs, the installation has turned what was once a grim, forgotten nickel mine into a landmark and a statement.

This semi-secret storybook hedge maze is also the oldest garden in the city.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

An independent naturist colony amidst 1000-year-old ruins.

A Spanish forest is filled with mysterious stone carvings.

This imposing modern citadel started out as a home renovation project.

The Gaudí-inspired building that was the start of Terrassenc modernism.

This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

An ancient tower built during Roman times as a lookout post still stands to this day.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A signal indicates the entrance to this alley, rumored to be a meeting place for witches.

This miniature Paris, built out of trash, is one man's two decade labor of love.