Two scuba divers in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Grotto of Adam and Eve, Boboli Garden, Florence (Firenze), UNESCO World Heritage Site, Tuscany, Italy, Europe

Grotto Pavilion reflected in the Great Pond, Catherine Park, Pushkin (Tsarskoye Selo), near St. Petersburg, Russia, Europe

The oldest Arboretum in the world, Arboretum Trsteno, near Dubrovnik, Croatia, Europe

Paradise Garden with Garden Grotto, Neuburg am Inn Castle, Neuburg am Inn, Lower Bavaria, Bavaria, Germany, Europe

Wrought iron gate and fountain grotto, baroque terrace garden, Schloss Hof castle in Schlosshof, Marchfeld, Lower Austria, Austria, Europe