Skatepark Arenys de Munt
The first skatepark to be built in Spain was in the mountain region of Arenys de Munt. Skatepark Arenys was buried by the owners in 1984, leaving no trace. During 2010 an excavation mission was undertaken to find the buy skatepark which was successfully excavated over a two year period and the park was reopened on March 7th 2012.
Link to photos and videos here
Speed World, in Coos Bay Oregon was the first concrete park to be built in the state of Oregon. Constructed during 1977 it was a horseshoe bowl that had 6' vert sections. It was unfortunately buried in either the late 70's or early 80's. This park still resides on the property today buried and lost for its recognition to skateboarding history.
Links to photos and videos here