This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

Legend says this fabled well held part of a mythical Norse tree.

A wooden street sign is the last remnant of this 400-year-old alleyway.

A unique zoological park home to over 30 species of wild cats, both big and small.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

One of the most historic cemeteries in Quito is an eclectic mix of architectural styles and famous tombs.

This eclectic sanctuary is a hodgepodge of various architectural styles, all crammed into one building.

Exquisite carvings of leaves, Green Men, and the occasional dragon adorn a medieval chapter house.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

Armenian monks at an island monastery in the Venetian Lagoon make a rare rose petal jam.

These morbid carvings remind churchgoers of the inevitability of death.

This unique, full-sized copy of the Bayeux Tapestry sports a few modern additions, including underwear.

The home of Ireland's last leprechauns is officially protected by the European Union.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

The hometown of a beloved manga artist created a treasure hunt for his popular ghostly characters.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

The sunlight passing through the opening of this huge cave system creates a magical effect.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

This tremendous timepiece was once the largest cuckoo clock in the world.

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.