The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

This historic black and white monastery is one of Bulgaria's architectural jewels.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

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

An architectural marvel that spans the Arda River, and has stories of a haunted past.

This 11th-century structure is one of the oldest churches in Romania.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

A Romanian church built from one single oak.

A muddy alien landscape that is home to rare species of exotic plants.

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

No one knows who built this strange cave of worship or exactly why.

A giant portrait of an ancient king looms over the river.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

Conspiracy theories and occult legends surround this mysterious natural rock formation.

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

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

A small town Romanian cemetery filled with darkly humorous gravestones.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

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

World's tallest cigar-shaped radio tower.