This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

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

The world's only above water sand volcano, believed to once be the bathtub of a priest.

Ancient stone graves shaped like ships provided a Viking-like burial to carry the dead to the afterlife.

This fantastic cave remained unexplored until 1948 when three schoolboys discovered a hidden entrance.

This trio of stone spires claims to be the only preserved medieval execution site in Europe.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Enigmatic bug-like sculptures mystify drivers along a Swedish highway.

Stone carvings record the Norse myth of Sigurd, providing a glimpse into Scandinavia's transition from paganism to Christianity.

The concrete skeletons of an abandoned Swedish town hide among the trees.

It was meant to help transport wounded soldiers to a secret underground hospital.

Visit the home of Sweden's beloved fictional character, Pippi Longstocking.

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

Walking through this narrow gorge will make you feel like you've fallen into a fairytale landscape.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.

An otherworldly, fossil-rich cobble beach holds Viking graves, cairns, and other remains.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

This collection of 80 polarizing foods aims to challenge your subjective notions of repulsion.

Micro-nation based around a nine-story high illegally built tower.

Crooked windswept pines give this old forest an enchanted and magical look.

The world's first ice hotel is still one of the most elaborate and beautiful.