Museum Island - Berlin
There are 5 museums on the island, including the Altes Museum by Berlin architect Schinkel. Inside there are Ancient Greek and Roman statues and pottery. Behind it, the Old National Gallery and the Pergamon Museum where you'll find the Pergamon Altar, an entire two-story Ancient Greek temple, and the Ishtar Gates – the Gates of Babylon.
The Berliner Dom dates to 1905 but was built to look a lot older than it really was. You can go up to the roof, or down into the crypt where a lot of the old royal family are buried.