A war-torn Olympic relic is being overtaken by graffiti and nature.

This only museum in the world dedicated solely to mushrooms.

Mysterious tombstones thought to be remnants of Atlantis.

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

Windblown rock formations in an ancient Roman quarry.

This weird, elephant-shaped rock also hosts two ancient tombs.

Greenery covers the face of a gently-dripping waterfall deep in the mountains of central Sardinia.

This cliff-face port is considered a masterpiece of mining engineering.

Crushed coral and crystals give the sand its signature coloration.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

Once one of the largest sites of silver deposits in Italy.

At an estimated 3,800 years old, this olive tree is one of the oldest on earth.

A wild annual race in Sardinia re-enacts Constantine's victory in Rome.

This tower has survived the times despite being composed of mud and camel hair.

Climbing the "mountain of frustration" is no easy feat.

A phenomenon that appears to make gravity work in reverse has been attributed to jinn, supernatural spirits from Arabian folklore.

In the middle of a barren desert, a massive, solitary rocky thumb juts out.

A historic structure that once housed pigeons used by farmers to help fertilize farmland.

Lions carved into the rockface adorn these two tombs built into the mountains of Dadan.

These towering cliffs jut dramatically from the middle of a barren desert.

Village of slate houses, built on a white marble outcrop.

It's believed human settlements from the Palaeolithic Age were established not far from this canyon.

A network of tunnels runs underneath the buildings of this ancient village.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.