Henry VIII's forgotten castle was built by the gunpowder-obsessed king to be defended solely by cannons.

This stretch of the River Severn where large waves flow against the current is the birthplace of river surfing.

The Bristol Camera Obscura housed in an ancient windmill.

This tiny 1930s Art Deco airport is a beautiful remnant of a bygone era.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

An alchemist's "magic door" stands in the middle of a Roman park.

Italy's curious field of mud volcanoes is named for being both gross AND salty.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Renaissance villa and gardens complete with a tormented colossus.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

The mummified relic of St. Antoninus.

This deceiving white sand beach gets its brilliant hue from the chemical discharge of a nearby factory.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

Geothermal waterfalls in Tuscany.

A 16th-century horror show built in a lovely Italian garden.

Jesus' footprints and the first catacombs in the world.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.