A blacklight journey through a celestial art exhibit.

Believed to be the only Orthodox church in the world that features a free-standing pulpit.

This Ottoman-era church is hidden amid a busy tourist area.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

These abandoned salt flats are now a haven for wildlife.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

A massive, abstract lookout tower providing a panoramic view of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Two stunning 17th-century libraries and a cabinet of curiosities.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

The true meaning behind this sculpture remains unknown.

The metal leaves on this tree are engraved with the names of Holocaust victims.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

A two-way chairlift system between Zugliget and the highest point in the city.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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

A neolithic tomb converted into a tiny chapel.

You can cross from one country to another in a single hop on this little bridge.

A museum preserving one company’s history of preserving food.

Human skulls and a stuffed goat made into a rocking chair can be found at this strange little store.

The youngest volcano in Central America.