A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Walk through Czech history in Prague's largest graveyard.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A century-long search for a church that was never there.

The history of German architecture is explored across this fairy-scale mini-city.

At this cemetery, artists are invited to design their own gravestones.

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

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

The oldest surviving botanic garden in the United States.

The former headquarters of history's oldest megacorporation.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

A beautifully eclectic mix of architectural styles.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

The world's only museum devoted to the wonders of fluorescence.

A floating cat sanctuary on an Amsterdam canal.

Museum preserving torture methods from the past.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

A psychedelic labyrinth on the San Francisco bay.

A creepy steel gremlin has protected the Bay Bridge since 1989.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."