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

A very classy 1920s-era bar right in Grand Central Station.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

These mosaics were created more than half a millennium ago and feature various animals.

A walk along this white sand beach creates a symphony.

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

This striking church was built from a Frank Lloyd Wright design more than a decade after the master architect's death.

Created by a local artist, these quirky sculptures each have their own names and personalities.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

Taxidermied cartoon heads, unseen illustrations, and famous characters all reside in this small gallery space.

This unique shop is full of memento mori art, antique medical equipment, secret society paraphernalia, and historical relics.

After the oysters have been shucked, and the restaurant's been shuttered, the terrazzo sidewalk from the 1940s is all that remains.

This quaint museum in a long-running workshop is dedicated to a fixture in New Orleans lighting.

This 45-story tall abandoned skyscraper is the third tallest building in New Orleans and Lousiana.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.

A treasure trove of rare and exquisitely detailed antiques

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The world-record holder for the longest bridge stretching continuously over water.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

Legend says a primate-like cryptid prowls this otherworldy sliver of the Louisiana bayou.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."