A plaque marks the underground site of one of London's "lost rivers."

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

The 28,000-year-old specimen is remarkably intact.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A preserved stretch of ancient fossilized trees with an impressive gem collection to boot.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

Eulogizing an unknown man's unusual demise.

Thirteen trees representing the original thirteen colonies were planted with soil from historic Revolutionary battlefields.

A winding path built in secret on the edge of the continent.

A miniature view of the park, caught in time.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Over 315,000 preserved amphibians and reptiles in jars.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

This Catskills museum preserves stumps from the earliest known fossil forest on Earth.

A gigantic 10-foot tall stone man.

The private island of Yale's elite Skull & Bones society is kind of a dump.

This tiny little island has, as the name says, just enough room for its single house.

The loneliest island in New York.