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

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

A brutalist gem towering over the heart of Milan.

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

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

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

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

Opened in 1787, this old-world treasure is said to be the oldest restaurant in Copenhagen.

A modest museum in the final home of Italian poet and father of modern Italian, Francesco Petrarca.

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

A monument to one of the greatest matadors of all time.

The Museum of the Forum of Caesar Augusta showcases the city's ancient Roman sewage system.

Despite their macabre past, these hooks are said to bring good luck to those who touch them.

This enigmatic Iberian sculpture of uncertain origin may have once guarded a burial site.

A historic cavernous cistern lies hidden behind a wall at San Marino’s stamp and coin museum.

Copenhagen's "other" little mermaid marks the historic location of past sea maid sightings.

The location of this small park was once the site of an infamous public morgue.

An expansive collection donated by an heirless nobleman formed this admission-free civic museum.

A memorial to honor those who were killed in a Bastille Day terror attack in Nice.