Roman ruins top white travertine terraces formed by ancient hot springs.

Live a night as a Byzantine King, with a minibar and private jacuzzi.

1513 Turkish world map, full of European state secrets and snarky commentary.

A marvel of Byzantine engineering under the streets of Istanbul.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A Civil War Museum with some notable medical antiques.