An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

Legend has it the lovelorn tears of a princess and a shepherd boy formed the blue and green twin lakes in the Azores archipelago.

Bits of flat terrain surrounded by cliffs make one of the most beautiful landscapes in the Azores.

Eat the ultimate iteration of Portugal's most beloved pastry.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

The site of the first battle of World War II.

The world's first and only escalator for lazy bicycles and their daunted riders.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

A favorite with sightseers and locals alike, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

These giant yellow bowling pins seem to be defying gravity.

The location of the world's first telescope demonstration.

The largest 19th century panorama in the world still in-situ.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

A luxury hotel housed in a former 15th century Gothic church.

This historical Netherlands fortress still bears the marks of its single siege.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Dynastic Home of the De Piro Family.

These temples are among the oldest free-standing stone buildings in the world.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.