300 years of pharmaceutical history on display.

Time stands still at this serene burial ground in the center of Budapest.

The remains of an entire Roman city can be explored in this interactive museum.

Hungarian self-built castle.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.

Check out engineering marvels of the past at this unintentionally retrofuturist museum.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

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

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

Current docking place of the SS United States, the fastest transatlantic ocean liner.

This elaborate towering structure was once famed for its revolutionary height.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

Yo, Adrian!

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Huge masonic hall in Philadelphia with lavishly themed rooms.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.