Landscape Arch is the longest arch in Arches National Park, and the longest national arch in the world according to the Natural Arch and Bridge Society. It is 290ft at its longest section. More recently, several chunks have fallen from it, and the trail leading below it has since been closed for safety reasons, but you can still get fairly close from the designated viewing area.
Landscape Arch is only 1 mile from the trailhead, and the path is fairly flat the entire way, with a few minor exceptions. Many hikers choose to end their hike here rather than continuing along the Primitive Trail and onto Double O Arch, Dark Angel, and Private Arch among others. This is also where the paved path ends, and a path along rock fins and slickrock begins. If you are up for it, continue on to some of the other magnificent arches where there are fewer crowds.