Remnants of a cone-shaped Nazi bomb shelter.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

A Milanese café entirely designed by the American director Wes Anderson.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The amazing wonder cabinets of a very rich Austrian archbishop.

A silly medieval mural preserved on the side of a Viennese house.

Op-art architecture designed for happiness.

The colorful stairs are made with marble from the world's major quarries.

This series of Scottish caves has no clear purpose other than baffling historians.

This repurposed church offers a more literal way to get closer to the heavens.

This Arcadian garden in the Pentland Hills boasts over 270 artworks by Scottish artist and poet, Ian Hamilton Finlay.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

This king penguin is a knighted brigadier of the Norwegian Army.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

An American ghost town hides along a side street in Scotland's capital.

The most loyal of little dogs, or a Victorian era publicity stunt?

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.