These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Ancient petroglyphs discovered only after a massive fire swept across Michigan in the 1880s.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

Largest magic museum in the United States with more than half a million pieces of memorabilia.

This 17th-century structure is a beautiful testimony to traditional Persian architecture

Thanks to its curved shape, this incredibly durable dam "whispers" to visitors.

MIT students continue the legacy of beloved professor "Doc" Edgerton through learning by doing.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

A wonderfully preserved example of London's 1960s-style high-density, low-rise public housing.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

Made from local Irish moss, this pie is served only in Prince Edward Island's potato museum.

Twelve sweet, nutty, life-sized statues are housed in this second-story shrine to almond paste.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

Modern megaliths form this work of cosmic, Celtic landscape art.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

A museum of co-operativism housed in the birthplace of the modern movement.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

A giant floating rubber duck-bunny painted with a different design every year.

The largest piece of cut lead crystal adorned a grave for 75 years and is now the shining star of a glass museum.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.