This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

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

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This extensive collection covers thousands of years of Polish military history.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A 15-foot-tall statue of the head of the Sopranos family greets passengers at a train station in southeastern Lithuania.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

Stockholm's deepest subway station is also a stunning ecological wonder.

The library's graceful rotunda is like a bibliophile's temple.

This chimerical bridge/tunnel appears to dead end right into the sea.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

Iceland's tribute to its thankless civil servants.