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.

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

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

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.

This massive underground salt mine now holds a sci-fi theme park in its depths.

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

Hidden treasures belonging to Mongolia's most revered and multi-talented monk spent decades buried in the Gobi desert.

History, geography, and shamanism meet in this eye-catching monument to the greatness of three empires.

A jagged silhouette of shamanistic stone heaps rises from the shore of this dazzling mile-high lake.

An exceptional assortment of fossils recovered from private collections.

The oldest Buddhist monastery in Mongolia has survived centuries of invasions, political shifts, and religious purges.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

Enormous statue of the Emperor of the Mongols.

This spiritual landmark for practicers of Shamanism is drenched in milk and vodka and covered in blue scarves.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Sloth rehabilitation center in the jungle of Costa Rica.

Electrical curiosity museum housed in an old transformer station.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Once known as the Illinois Asylum for the Incurable Insane.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.