Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

This Shetland Islands bus shelter may be small, but it squeezes in a couch, a desk, some art, and even an old telly.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

A remarkably well preserved tower dating all the way back to the Iron Age.

The house that took a plunge into the facade of a museum.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

The Habsburgs' royal collections of art and wonders.

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

Op-art architecture designed for happiness.

A spherical "micro-nation" in the heart of Vienna.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Where Venice's gondolas go for a tune-up.

The only museum with its curator—and her pets—buried inside.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

Venice's "Island of the Mad."

This community on a small Venetian island has taken to painting their houses in bright neon hues.