This massive concrete sculpture is said to be the heaviest communist monument on Earth.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

Imperial palace of Emperor Galerius, the Emperor behind the worst Christian persecutions during the Roman Empire.

Moss and stone turn this waterfall into an otherworldly liquid veil.

The Natural History Museum that time forgot.

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

The growing stones of Romania.

Religious structure known for its sculpted details.

Packed to the ceiling with antique taxidermy and hunting arms.

Budapest's Communist-era statues, banished to the suburbs.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Museum dedicated to the terror regimes of Hungary.

A Hungarian pharmacy museum with a box full of mummy powder.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Finnish lake, and scene of an infamous murder mystery.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

Czech architects borrow from the nest design of the stork to revitalize a farmstead, hoping to inspire the same loyalty the birds had shown.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

A church of bones, decorated with 40,000 human skeletons.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.