Ta Prohm is a temple of towers, closed courtyards and narrow corridors. Many of the corridors are impassable, clogged with jumbled piles of delicately carved stone blocks dislodged by the roots of long-decayed trees. Bas-reliefs on bulging walls are carpeted with lichen, moss and creeping plants, and shrubs sprout from the roofs of monumental porches. Trees, hundreds of years old, tower overhead, their leaves filtering the sunlight and casting a greenish pall over the whole scene.