The floor-to-ceiling collection in an old factory is a unique alternative to stuffy galleries.

Quite possibly the last cross all humans will ever see.

A preserved factory in the "Home of the Carrousel" is now a museum dedicated to the classic wooden ride.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

This restaurant preserves and serves lesser-known and regional Nepali food.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Healing Springs that once ran red with soldiers' blood.

A volcanic fissure over two miles long and up to 70 feet deep.

This large maar crater in Oregon is the bigger brother to Hole in the Ground.

This massive mushroom has spent centuries eating its way across a huge swath of Oregon.

This perfectly preserved Chinese medicine shop was untouched for decades before being reopened as a museum.

Make it an offering.

All aboard the world's longest miniature railway.

A curious building honoring past and current members of a historic musical comedy troupe.

America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.