A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

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

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

An effigy of the deity emerges from a temple's water every 40 years.

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

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This contorting sculpture is the tallest in San Francisco.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

A fake medieval village in the middle of Turin.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

A suspended footbridge allows for traversing this gorge carved through the French Alps.

A medieval fresco which reminds visitors that death will come for us all.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

Pilgrimage site for star-crossed lovers.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

This Renaissance palace features a unique architectural design and is now home to the Ferrara National Art Gallery.