The Monumental Axis is the long straight runway of the aeroplane-shaped Pilot Plan — 16 km west to east, ending at the Esplanada and the Three Powers Plaza. Along its length sit most of the city's monuments: the JK Memorial at the western end, the TV Tower in the middle, then the cathedral, theatre, museum-and-library pair, ministries, congress, and the Three Powers Plaza at the far eastern end.
Walking the full length is unrealistic — about 12 km of monumental sights — but the central stretch from the TV Tower east to the Cathedral and on to Congress (about 2 km) is the must-do, and on a Sunday morning when the road is closed to cars, it is genuinely pleasant.