The frozen bubbles that form on the icy surface of this Canadian lake contain enough methane to create a small explosion.

The only way to visit this old resort hotel is with scuba gear.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

With a floor made of thick glass, this observation deck offers a full view of Sunwapta Valley's mountains and rivers.

This First Nations monument is a peaceful spot with vast views of the Calgary prairie.

One of the best-preserved, yet least visited stone circle sites in Cumbria.

Legends say this red sandstone monolith and the dozens of smaller boulders that surround it were once a coven of witches—before a Scottish wizard turned them all to stone.

This medieval castle is filled with an eccentric collection that ranges from ancient Egyptian artifacts to taxidermy to a mummified hand that was cut off during a duel.

Cycle, walk, or run up and down on an old historic railway path.

Site of the golf match between James Bond and Goldfinger.

A series of idealized caves carved to entertain guests.

A sense of bewilderment encounters visitors when they happen upon this former railway bridge.

The ruins of a 12th-century Cistercian monastery can be found alongside World War II tank traps and pillboxes.

This mysterious chalk figure of a horse has been recreated and restored for more than a century.

An enigmatic sculpture depicts a ruined home with debris stretching for over half a mile along the river.

A picturesque garden with a surprising past.

This sculpture combines the literary Alice with her real-life inspiration.

Home to the ancient Roman temple of a lesser-known Celtic god that inspired J. R. R. Tolkien and H. P. Lovecraft.

This educational institution and reference library specialize in the psychic arts and mediumship.

The ruins of a Roman fort lie in the shadows of an imposing medieval castle.

This Georgian Gothic building was created to shelter and feed deer.

Baked in 1898 and still almost flawless, this floral masterpiece is considered the world's oldest complete wedding cake.

This early Norman castle was the first historical monument protected by an act of Parliament.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.