In 1912, Prince Albert I acquired the promontory of the observatory in Les Moneghetti, a steep limestone outcrop overlooking the principality. He commissioned Louis Notari, Chief Engineer of Monaco, to transform the raw cliff face into a garden that would look as though the plants had always been there. Notari designed natural-looking rock features connected by narrow footbridges and winding paths, turning the vertiginous terrain into an asset rather than an obstacle. The garden opened to the public in 1933, by which time it had become one of the most remarkable botanical collections on the Mediterranean coast. Over a thousand species and six thousand varieties of succulent plants from the Americas, Africa, and the Arabian Peninsula found a home on these terraces, their spiny silhouettes framed against the sea.

Beneath the cacti and agaves lies an entirely different world. The garden sits atop a grotto that has yielded prehistoric artifacts dating back tens of thousands of years, evidence that this cliff sheltered human communities long before the Grimaldis arrived. The Museum of Prehistoric Anthropology, housed within the garden complex, displays these excavated finds and connects the modern spectacle of exotic botany to the ancient human story of the rock itself. The juxtaposition is striking: above, plants imported from distant continents arranged with horticultural precision; below, the bones and tools of people for whom this promontory was simply home.

What sets the Jardin Exotique apart from other botanical gardens is the ambition of its collecting. Successive curators have mounted expeditions to the deserts and highlands of the United States, Mexico, South America, Africa, Madagascar, and Yemen, returning with specimens that now thrive in Monaco's mild Mediterranean climate. One curator, Marcel Kroenlein, personally contributed over two thousand plants to the collection through his travels. The garden became a living catalog of the world's driest landscapes, concentrated onto a single Monegasque cliff. Giant columnar cacti from the Sonoran Desert stand beside Euphorbia from East Africa and aloe from Madagascar, each species placed to take advantage of the specific microclimates created by the cliff's angles and elevations.

The garden closed in 2020 during the COVID-19 pandemic and has remained shuttered for extensive renovations, with plans to reopen in March 2026. The botanical center has continued operating, and for a time guided tours were offered on Saturdays, but the full garden experience has been inaccessible for years. When it does reopen, visitors will find the same dramatic combination of Mediterranean light, engineered cliff, and desert flora that has drawn nearly a century of admirers. Few places compress so much botanical diversity into such a compact, vertical space, and fewer still do it perched above one of the most famous coastlines in the world.