Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

London's old-school healing garden.

Rebuilt remains of a temple to Roman god Mithras.

This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

Stroll through Welsh history in a village of reconstructed structures.

These haunting ruins belong to an ancient village that once had one hell of a view.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Early prototype for Frank Lloyd Wright's Guggenheim.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

The first green space constructed on an elevated viaduct.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.