The decaying adobe remains of an old homestead are just off the beaten path in Joshua Tree National Park.

An eerie natural formation that looks right back at you.

Ancient human, animal, and geometric figures drawn in the earth.

An off-grid art installation that encourages its visitors to imagine a world without waste.

This historic tower in the California desert promises visitors a "vortex of good vibes".

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.

This is one really big nut.

This church also serves as a lighthouse complete with a beacon.

Hundreds of signs pointing to the birthplaces of current Helsinki residents form stalactites on the ceiling of the cave-like Kamppi metro station.

Dedicated to the outnumbered Finnish forces who pushed back Soviet forces during the conflict.

The door to the museum holds a unique artifact from the Finnish Civil War.

This poignant art installation raises awareness of violence against women.

The mark of the Devil's horns on a marble column in Milan.

Massive galleon from a box-office bomb docked in Genoa.

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

These elaborate gothic monuments honor Verona's medieval lords.

The oldest church in Mantua was buried for centuries under the facades of other structures.

A medieval tower with a suspended iron cage used as an open-air jail for criminals who were exposed as a warning.

The city of Parma's cathedral is home to one of the greatest illusionistic frescoes of the Renaissance.

The final resting place of the famous violinist, after his corpse was denied a proper Catholic burial for decades.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.