At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

A coal fire has been burning underground here since 1896.

Originally built in 1869, this castle is currently part of Felician University's campus.

This unique formation is characterized by hexagonal basalt rocks stacked in unique formations.

Journey up the capitol building's cupola for an amazing view of Topeka.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A perfectly preserved example of a fortified Medieval ricetto.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

A stone wall commemorates the legend of a ferocious dragon who literally got his butt kicked by a knight.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

An ancient glacial pothole waterfall in the heart of the Green Mountains.

This museum located in Fondi is also said to be the most haunted building in town.

A secret door leads to this cozy dive that sells only “milk.”

A sacred Ojibwe site covered in pictographs next to Lake Superior.

Toss a Frisbee through the ruins of this Colorado gold mining town.

This stone windmill marks an old, mysterious homestead in what is now central Austin.

This mosaic-covered bar is brimming with curated curios.

This former guildhall with a bacon-like exterior is now home to a museum covering 600 years of Antwerp's musical history.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

NYC's legendary underground network for bovine transportation.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Lady LeWinDa Milkzalot showcases Lewis County's dairy farming heritage and boasts an impressive rotation of seasonal outfits.

Tucked in the back of this amazing antique store is an important piece of medical history.

This sprawling taxidermy collection celebrates the art and history of sport hunting.