Merchants' Exchange Building (Philadelphia)

The Merchants' Exchange Building in Philadelphia, its curved colonnade and lantern catching the light in August 2015. William Strickland designed it, and it went up between 1832 and 1834. Businessmen met here to trade everything from ships' cargoes to real estate and stocks, and the Philadelphia Stock Exchange was among its tenants, which makes this Greek Revival rotunda an American answer to Europe's grand bourses. Look up at the lantern: it is modeled on the Choragic Monument of Lysicrates in Athens. The National Park Service now looks after the building as part of Independence National Historical Park.