A monument is a structure or object that is intended to commemorate a person, event, or achievement. LANDMARK is an easily recognizable natural or man-made feature used for navigation, a COLUMN is a tall vertical structure usually made of stone, a TROPHY is an object awarded to the winner of a competition, a HEADSTONE is a MARKER placed at the head of a grave, a MAUSOLEUM is a large TOMB or MEMORIAL building, an OBELISK is a tall four-sided tapering monument, a MONOLITH is a single large block of stone, a MEMENTO is an object kept as a reminder of a person or event, a TOMB is a burial chamber, a LEDGER is a stone slab used as a grave MARKER, a MASTERPIECE is an exceptionally good work of art, a MARKER is a sign or object that marks a location, a MEMORIAL is a structure or monument built to remember a person or event, a CENOTAPH is an empty TOMB or a monument erected in honor of a person or group of people whose remains are elsewhere, and a stele is an upright stone slab or pillar bearing an inscription or relief design.