Riviera Maya is rich with archeological sites. One of them, Tulum, is a compact and relatively well-preserved historic city on a cliff overlooking the Caribbean Sea. It is also the only one remaining from those built on the brink of Hispanic conquest. Its new program, Tulum de Noche, offers visitors an audio tour in six languages and a live guide who leads tourists into the site in complete darkness, with sea waves crushing somewhere underneath. Mysterious red, green, and blue lights are playing on the ruins of formerly opulent castles, temples, and dwellings creating an unforgettable impression of a ghost town. Photo by Yuri Krasov. Tulum temple at night.