A volcanic cone that formed over 600 years ago.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The man who voiced Bugs Bunny, Daffy Duck, Porky Pig, and more has a headstone reading, "That's all, folks!"

An aptly-named street near the birthplace of the modern LGBT rights movement.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A work of art that pays homage to a Victorian timepiece in Providence.

Out of a labyrinth of abandoned tunnels and stops, this Queens subway station is arguably the most mysterious—if it exists at all.

Only a few pieces remain of a grand 16th-century water clock that once announced the changing hours with the sound of bells, gongs, and drums.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

An ode to Japanese artist Hokusai, with a bit of a comical twist.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

The three biggest silent film stars once shot iconic scenes here.

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

A touching tribute to the "Queen of Soul."

This bank is widely believed to be the inspiration for the offices of Philip Marlowe, the hardboiled detective featured in a number of Raymond Chandler's stories.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

Built for an exposition in 1915, these horticultural displays have stood the test of time.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

This Garden District mansion was built to be bigger and grander than its original owner's former partner turned rival.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

Dedicated to the explorer who opened Japan to the West.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”