A perilous medieval road leading right into the sea.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

Legend has it that any woman who kissed this statue would soon be married.

The "Mona Lisa" of funerary art.

The only Shinto shrine in Europe that has been officially sanctioned by Japan.

This ancient market is often referred to as the oldest shopping mall in the world.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

During the 1990's nearly all of the world's LSD is thought to have come from the operators of the lab once located in this missile silo.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

This temple contains what might be the world's oldest optical illusion.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

Nature took her revenge on the "Wickedest City in the World."

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

The largest cave in Northern Europe.

This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

Home to the world's oldest wooden building.

A collection of old steam and diesel locomotives sitting in a fenced-off garden.

One of the oldest living oak trees in the Southeast.

The deepest hole drilled in the name of science, where evidence of Precambrian life was found.

One of the only places where Earth’s mantle lies above water.

The fragmented remains of a massive public bath connected to the city's water supply.

In a dry, neglected cemetery lies the unassuming grave of a soldier vilified in life but celebrated in death.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.