Legends surround an ancient tree trunk riddled with nails for good luck.

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

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

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

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

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

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

The beautiful baroque library of the Hapsburg empire.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Macabre museum devoted to historical Viennese murders.

The final resting place for the remains of 143 Habsburg royalty.

Often mistaken as a medieval Gothic monument, this unique cornerstone only dates back to the 1980s.

In an area known in Bratislava’s postal history, this sculpture sits equipped with a functional postbox.

The largest fountain in Bratislava.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

The world’s first statue of the late Apple co-founder.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

The oldest private art gallery in all of Hungary.

A Hungarian optometrist's charming collection of Asian art and curiosities.

A museum in the childhood house of a medical pioneer.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Once the home of a hermetic monk, this cave now houses a small church.

A tribute to the builder(s) of Bitcoin.