Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Salt cured mummies continue to turn up in this Iranian mine.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

This singular broken monument, now housed in a museum, was the cause of a worldwide "Mayan Doomsday" phenomenon.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Go inside to really appreciate this 500-year-old technological masterpiece.

The oldest operating pharmacy in the world features 800-year-old recipes.

Pompeii's less famous neighbor is still revealing her secrets.

Tiki luxury on Nob Hill.

Once the gateway to the utopian dream-village of a Civil War embalmer.

A living time capsule of the 1960s Richardson Bay water-front.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.