Singapore's landscaping project is home to 18 incredible Supertrees.

A delightful architectural wonder awaits on a lake island in Kuala Lumpur’s oldest park.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

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

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Once a palace for the Archbishop of York, these 15th-century ruins now serve as a haunt for history buffs.

Legend has it the famous Robin Hood would attend mass at this 12th-century Cistercian abbey in Sherwood Forrest.

Eighty million natural history specimens call this gargantuan museum home.

Locals call it the "Give Peas a Chance" bridge because of its distinct graffiti.

This early Norman castle was the first historical monument protected by an act of Parliament.

Local legend says this unusual chimney is actually a broken-hearted man's tomb.

You can climb to the top of the column built to honor the "father of British inland navigation."

Historic medieval fortified city in southwest France.

A reportedly haunted 14th-century church is curiously facing the “wrong direction.”

This ancient Bedfordshire church was abandoned when the village's population slowly began migrating to new towns.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

Catacombs turned marketplace.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.