The undercroft is a spectacular example of medieval Cistercian architecture.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

These abandoned coal mine towers near Sherwood Forest might soon boast the U.K.’s longest zip-line.

The once-a-day siren is a reminder of the days before time was standardized.

Perhaps the tiniest sculpture in Saint Petersburg is a little bronze finch inspired by a song.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

This Roman arena once played host to bloody gladiatorial battles.

A mocking tribute to the past and modern leadership of Prague.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The "Prussian Versailles" that is as glorious today as when it was built.

This massive memorial commemorates those who died in the Manchester Arena bombing.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

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

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

This abandoned Greek island was the last active leper colony in Europe.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

This lonely memorial marks the supposedly haunted site of a brutal 19th-century murder.

This 12-foot-tall T-rex is the largest K’Nex skeleton sculpture in the world.