These 500-year-old frescoes depict the city in its glory days.

An ancient well nestled at the foot of Glastonbury Tor, shrouded in Arthurian legend and revered for its purported healing waters.

A 150-year-old steam locomotive crosses the southern half of the island daily.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

A prison tower–like edifice honoring a beloved local benefactor.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

Site of the first radio and telephone broadcasting companies in Copenhagen.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This grubby wall is said to be one of the Earth's esoteric energy centers.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

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

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A two-inch thick solid brass rod that extends an astounding one kilometer straight into the earth.

An approximately 500 million-year-old rock outcropping covered in fossilized bacteria.

A small cave hidden deep within the Jenny Jump State Forest.