Among the most important buildings used during the American Revolution is the Old Exchange and Provost Dungeon. Today, the upper floors house period antiques and clothing, while the dank dungeon offers a window into the conditions American patriots once had to contend with. The dungeon itself is a marvel of design, with impressive structural arches that have withstood all kinds of damaging weather. Learn from guides in period costumes, and be sure to check out the pieces of the original 18th-century Charleston Harbor wall that were revealed during recent excavations.