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

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

A 19th-century shrine covered with prosthetic body parts as votive offerings.

This tiny structure was built by the creator of the Brooklyn Bridge.

This giant disembodied horse head seems to balance impossibly on its nose.

A glittering Thai Buddhist temple in suburban Pennsylvania.