A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

During World War II, blimps were a key part of the United States' defense against German U-boats—this building could house a dozen of the armed airships.

This 6th-century church honors St. Tudno, the patron saint of Llandudno.

A measuring mishap led to these artificial stone ladies losing their stomachs.

This stately Victorian-era burial ground overlooking the Pacific Ocean is home to the graves of some of British Columbia's most famous figures.

One of the oldest living oak trees in the Southeast.

A sprawling ancient Jewish cemetery with over 30 rock-hewn burial caves.

The wooden sculptures are studded throughout a small New Zealand town.

One of the largest sand dunes in the world is nicknamed the "Scary Mountain" due to its steep slope and sharp incline.

The western-most fortress on the Great Wall of China has gone from a strategic stronghold to a kitschy tourist carnival.

An expansive book store, art gallery, and curio shop with wares ranging from tarot cards to novelty socks.

A landmark in the history of technology and computing is hidden in a tiny Baroque chapel.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

The second-largest natural arch in the Chartreuse Mountains.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

The decaying remains of a once-luxurious Soviet spa town.

This audio art installation pays tribute to the weather and unique linguistic history of the archipelago.

This elderly couple's hand-picked collection of rare gems is one of the finest in all of Iceland.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

A 19th-century architectural masterpiece with ties to Gustave Eiffel.

This Neolithic passage tomb forms part of a World Heritage Site.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.