A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

The history of radiation is on safe display at the foot of a radiation science laboratory.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This Parisian café sticks almost exclusively to an ethos of reuse.