Rapunzel's Tower is hidden in a large rock pit by a cave. The cave leads out into the forest with its opening hidden by a curtain of plants. At the base of the tower is an alternate entrance Mother Gothel used to go in and out of the tower before she took Rapunzel and in the years that she was too young to pull her up, with a hidden trapdoor leading up into the main rooms of the Tower.
Within the tower and over the years, Rapunzel has painted a series of murals. The tower has several rooms including bedrooms for both Rapunzel and Mother Gothel, a central room which would be the primary location of Rapunzel's gallery, and a staircase leading to an upstairs room.
Like in older incarnations of the story, the tower is hidden.
There are several astronomical based art painted inside Rapunzel's chamber, including an accurate star map and a diagram of the Solar System, with one of Corona's sun emblems representing the Sun (although incorrectly depicted with eight planets (Mercury to Neptune) and five dwarf planets (Ceres, Pluto, Haumea, Makemake, and Eris), which is the current lineup, instead of stopping at Uranus, the outermost planet at the time of the film's events). This was most likely intentional, since Rapunzel likely tracked the position of the stars and planets in the sky to determine the next lantern lighting festival.
Unlike the original fairy tale, where the tower was only one room with no stairs, the Tower in the film has three separate rooms (Rapunzel's room, Mother Gothel's room, and the Living room) along with stairs.