This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

This giant pocket watch is the third iteration of a local landmark that has been standing just off the Santa Fe Plaza for over 100 years.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

This sculpture perfectly models the molecular structure of a drug that was never produced.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

The history of radiation is on safe display at the foot of a radiation science laboratory.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Two stunning 17th-century libraries and a cabinet of curiosities.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

The only ancient site that remains on the south bank of the sacred Ilissos river.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.