In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A mysterious taxidermy man-beast of the seven seas.

Few other hotels can rival the grandeur of the Castle in the Rockies.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

Cairns built to bring travelers good luck stretch across the land like miniature stone mountains.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.

Three columns of volcanic rock shoot out of the ocean.

Once designed as a natural history museum, this building is now home to a massive art gallery.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

Scotland still bears an enormous scar of its Roman past.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

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.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

The ruins of a medieval monastery named after a type of tree.

This European portal tomb has a capstone that weighs around 150 tons.