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

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

A fantastical bed and breakfast with magically unique rooms.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

A macabre anatomy museum tucked within an old Italian hospital.

A wooden dock art installation on Chiloé Island taps into the island's indigenous mythology.

The hellish conditions of this abandoned mine that snakes beneath the Pacific Ocean gave it its diabolic name.

This influential Renaissance-era library was once the haunt of kings and monks.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

The mass grave of the 27 victims of the "Vampire of Hanover."

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

Summer in Scotland begins with a spectacularly wild and colorful event rooted in ancient pagan traditions.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

A medieval house adorned with enigmatic carvings, including one of a man displaying his masculine attributes.