An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The last bastion of Roman presence north of the Alps looms over a German town.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A grandiose octagonal home crowned by a large dome stands out among the antebellum mansions.

Florence’s mother built a stairway down to her daughter’s coffin so she could comfort her during storms.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.