Site of the largest impact event to occur over land in Earth's recorded history.

Dozens of padlock-trees along the Moscow River.

Gigantic natural towers in a Russian plateau.

This remote lake in Siberia supposedly contains a fearsome sea monster.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

What was once an underground Nazi city is now Europe's largest bat reserve.

A remote forest of stone pillars along the Lena river.

The Uyghur settlement in the middle of a lake continues to raise questions.

Something's watching you.

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

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

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.

This wooden recreation of a 9th century lake village looks as though it was built yesterday (which it relatively was).

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

The only things left in this abandoned Latvian graveyard are a mysterious stone and a ghost story.

A preserved oak tree about 3,500 years old found in Riga, Latvia.

These crumbling Latvian forts make for some haunting seaside ruins.

Reputedly haunted sandstone necropolis with exquisite stone carvings.

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.

A naturally beautiful, seemingly bottomless deep blue spring.

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

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