This Stockholm light tower can be controlled by anyone with a smartphone.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

A local tree surgeon has created a whimsical walk full of carved tree stumps near Scotland's Loch Lomond.

Artists and musicians now rule over this former rail station.

A naturally mummified 2,000-year-old man.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

Catacombs turned marketplace.

Eighty million natural history specimens call this gargantuan museum home.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The world's largest collection of witchcraft regalia.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

Oslo's historic toboggan run has been letting thrill seekers slide from train stop to train stop for over a century.

One thousand trees were planted in Norway to be used to print books a century from now.

Hundreds of mossy stones engraved with bits of philosophy, literature and random musings.

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

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

From under the bed of one of the co-founders, this server helped launch the notorious file-sharing website.

His body was found mysteriously preserved in a Swedish mine over 40 years after his initial disappearance.

Bring your hiking shoes, wool socks, and thermal underwear for a stay in these cozy forest huts.