Acropolis Museum

This guide to the Acropolis Museum in Athens starts underfoot, with the excavated Athenian neighborhood of streets, baths and workshops that engineers found while digging the museum's foundations, and the engineering feat that lets the building float above it. Upstairs, the Parthenon Gallery is built to the exact dimensions of the temple's inner chamber, its marble frieze half original and half plaster cast. The originals left Athens in the early 1800s, carried off by a British ambassador. Worth pausing at the gallery's glass wall, where the real Parthenon sits directly in view.