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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Macabre astrological automaton clock dating to the late 1400s.

The first museum in the world devoted to sexual gadgetry.

The world's largest moose statue towers above the highway between Oslo and Trondheim.

Research station devoted to mysterious floating lights seen in a Norwegian valley.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

This roadside attraction looks like a flying saucer parked atop the tundra.

The great polar explorer is remembered in this far northern town, where he embarked on his final expedition.

The world's most charming instant portrait studio also happens to be its smallest.

This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

This record shop and unofficial black metal museum is an ode to Oslo's heaviest musical export.

A stunning architectural yet functional feat, towering over Oslo.

World's strongest whirlpool.

This 135-year-old weather station studied the effects of the climate on human health.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

An ancient knight and a symbol of the city's freedom.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

This modern, multimedia museum takes visitors on an evolutionary journey back in time.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.