Higashi-gyōen is the only corner of the Imperial Palace proper that is regularly open to the public, and it makes for a pleasant retreat from the grinding hustle and bustle of Tokyo. Here you can get up-close-and-personal views of the massive stones used to build the castle walls, and even climb the ruins of one of the keeps, off the upper lawn. Although entry is free, the number of visitors at any one time is limited, so it never feels crowded. Entry here is through one of three gates: Ōte-mon on the east side and Hirakawa-mon and Kitahanebashi-mon on the north side. Most people enter through Ōte-mon, which is situated closest to Tokyo Station, and was the principal entrance to Edo Castle for more than 200 years. Here you may want to make a stop at the Museum of Imperial Collections, which mounts small exhibits of the 5000-plus artworks held within the palace.