The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

What was once the base for Russia's first nature reserve is now a ghost town, right on the shore of Lake Baikal.

The mummified remains of Dashi-Dorzho Itigilov, Russia's most important Buddhist.

Unusual, mushroom-like rock formations caused by weathering and water erosion, set to disappear, according to geologists.

A city block packed with whimsical sculptures that seem to be plucked from a tiled fantasy world.

No one knows why ancient labyrinths were built on this tiny northern island.

Siberian ghost town built by gulag prisoners.

The coldest city in the world.

A Marxist summer camp full of fantastical statues lies tucked away and forgotten in the forests of Moscow.

An early-20th-century "dacha" village of quaint cottages curiously located in a modern part of Moscow.

The villagers of the coldest inhabited place on Earth adjust to unique challenges presented by day-to-day living.

Legends of time travel and magical woodland creatures bolster the natural charm of this verdant sanctuary in the midst of Moscow.

Stunning examples of Russia's 18th-century wooden architecture.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

Home of the first female Hungarian poet, where her secret writing lay hidden for over a century.

A spooky spot along the road where things mysteriously seem to move uphill by themselves.

The growing stones of Romania.

A medieval church built up to defend its village.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

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

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