I have had the opportunity to visit the Botanical Gardens in San Diego's Balboa Park several times over the years and they never fail to impress me. The flower displays are magnificent. Their orchid collection is outstanding. The building is a wooden lath structure (one of the largest of its kind) and it looks (sort of) like a giant bird cage. Walking through the gardens always brings on a feeling of peace and tranquility. For me it is a must see.