Tower of the Sun is one of the most unforgettable landmarks in Osaka. Designed by artist Tarō Okamoto for Expo ’70, the tower has a strange but fascinating appearance that becomes even more impressive in person. The combination of the giant faces, unique design, and the peaceful atmosphere of Expo ’70 Commemorative Park makes it feel almost surreal.
You can buy tickets in advance from their web site. Tickets to the tower already include entrance ticket to the park, so you can skip buying it in the entrance. But if you've bought it, they return money in ticket office of the Tower.
The Tower itself is really unusual and worth visiting. Sadly, you can make photos only in the first floor. It would also be nice to add translation of materials in the exhibition in English.
I visited on a weekday late morning and, luckily, was able to buy a ticket on the spot. I found the moody music and images a bit dated but absolutely worth it, if only to have the chance to see the interior structure, especially the arms. I never quite understood this tower, but became quite fond of it as the day progressed, and enjoyed seeing it as the light softened. If you can, do plan to stay into the evening to see the holiday illuminations.
Tip: The route involves a climb up an interior stairway, 145 steps spread across 6 floors, and reaching just about halfway up the tower, then a descent down a different, more narrow stairwell. There is an elevator but it seems access may be by reservation.
An interesting giant art piece, it's hard to tell from the photos just how enormous the tower is. Unlike other tall buildings which are very... "building-like", the humanoid shape makes it more interesting to look at, and really felt like you are standing next to a giant human.
The tree of life inside is also worth seeing, overall a great experience.