This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A man has revenged his true love's betrayal through tears and stone genitalia.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

No one knows who's responsible for decorating this tunnel with stuffed animals, but the people love it enough to protest their removal.

Sweden's "good old days" painstakingly re-created in a model village.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

This Stockholm light tower can be controlled by anyone with a smartphone.

The world's largest model of our planetary system.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

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

Apartment complexes built into huge repurposed natural gas tanks.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

This cubist Vienna church building looks like some sort of alien stonehenge.

This museum promotes informed contraception by documenting its often secret past.

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

The topiary maze at the Habsburg hunting lodge.

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

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

A modern sliver of architecture in Roma.

Roman-era ships unearthed...

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

The Pope’s secret escape route.