Legends say that this Art Deco apartment building almost became Hitler's British headquarters.

A unique seaside cave where Aleister Crowley faked his own death.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This castle has links to Portugal’s founding and struggles for independence.

This giant sculpture made of trash is a critique of society's wastefulness.

A hidden three-foot-wide house separates these two regal churches.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

Legend has it that seven Anglo-Saxon kings were coronated on this stone, located in the appropriately-named town of Kingston.

A domino effect created with Britain’s iconic telephone boxes.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Metal horses galloping through a London fountain provide a link to the city's past.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

This ancient Egyptian obelisk still bears the wounds of World War I.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

This secluded walkway overlooks a magnificently wild London green space.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.