Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

Ancient structures used to make and preserve ice in the deserts of Persia.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

A tribute to a Ukrainian heroine who went undercover and killed several Nazi operatives.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Mysterious spherical rocks in the semi-desert of western Kazakhstan.

A plaque commemorates the spot in the Oregon woods where the first-ever Geocache was hidden.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

This precariously balanced boulder is said to be a hunk of stolen butter dropped by the gods.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

If they push on just the right spot, even the weakest person can move this titanic boulder.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

These spooky and unusual stone formations create an underworldly landscape.

The great Danube river starts here.

A boulder carved into the shape of the cosmonaut's head.

Walk through Czech history in Prague's largest graveyard.

A fiery crater has been burning in the Karakum Desert since 1971.

A huge monument to a bizarre book written by Turkmenistan’s longstanding dictator.

This magnificent blue mosque in Afghanistan is surrounded by thousands of white doves.

This 12,000 year old Iranian cave village has been continuously inhabited for over 3,000 years.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

Marked by the hand of the explorer Henry Morton Stanley.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.