This cave complex might provide a link between the Neolithic and the Classical Greek period.

A staircase made of gravestones leads up to this church built into a giant rock.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

This 18th-century former mosque held the first Hellenic Parliament.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

An authentic recreation of a 19th-century museum for "working class folks."

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

Hidden amid the old-world charm of Savannah is a museum dedicated to the world of oddities and criminal history.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

St. Augustine's record-setting narrow street was designed to protect against pirates.

Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

The ruins of an open-air theater built on this Georgia island in the 1970s.

A Bibliophile's Dream.

The beloved home to all publications indie, erotic, and punky.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

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

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.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.