A hidden stream deep in the mountains creates one of the largest tufa waterfalls in Serbia.

This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

A pair of connected skyscrapers form this symbolic gateway.

For decades, Hungary's Communist Party insisted this gulag had never existed.

An exploration of a small ethnic group’s heritage through their exquisite folk art.

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

The remains of an entire Roman city can be explored in this interactive museum.

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

A faithful reproduction of Al-Jazari's enormous water clock.

This sprawling, formerly elite sporting complex in Amman, Jordan has become a local picnic spot.

An underground network of massive stone arches and their skylit vaults support ruins of portico structures above.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

A World War II torpedo launch station abandoned off the Polish coast.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

The rusted creatures wait to be discovered in Prague's botanical garden.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

Looming communist pillar with a Czech twist.

São Paulo's oldest magic shop has been hiding in plain sight for nearly four decades.

A self built castle built by a salt worker in Brazil.

Deep below the dry landscape of Bahia, a cave with intense blue water to float in.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

Art becomes an enchanting part of the environment at this wooded sculpture park.