The Sun will be only 8.7° above the horizon. Find a spot with a clear west-northwest view; a hill or a building hides totality. ISO 12312-2 glasses are mandatory during the partial phases.
On 12 August 2026, Palencia (Castilla y León) will sit inside the path of totality of the first total solar eclipse visible from mainland Spain in over a century. Maximum is at 20:29:51 (Spanish peninsular time) and totality lasts about 105 seconds: the sky darkens like night and the solar corona appears.
Because it happens right before sunset, the Sun will be very low (8.7°). That's why what matters is not just being in the right place, but having the west-northwest horizon clear of hills and buildings.
Data computed for the coordinates of Palencia (42.0096, -4.5288). Verify with the IGN (Spain) before travelling.