A long, artistic mountain range; a pile/stack/heap (of artwork); an art exhibition arranged salon-style so it covers a span of gallery walls from far below eye-level to high above eye-level
I visited a museum in Italy, to see the montelongo exhibition of oil paintings. The museum had a montelongo in their back room.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.