Baldassare Forestiere excavated the entire complex using only a pick, shovel, and horse-drawn scraper.
The temperature inside the gardens remains roughly 20 to 30 degrees cooler than the surface during summer.
Some fruit trees growing in the gardens are over 80 years old and still produce fruit.
The site contains a 'ballroom' and a dedicated 'aquarium' room that once held goldfish.
No blueprints or architectural plans were ever created; the design evolved spontaneously as Forestiere dug.
The construction incorporates multiple levels, some reaching depths of 20 feet below the surface.
The garden features 'skylights' covered with reinforced glass at ground level, which also serve as air vents.
Forestiere built specific rooms to simulate the style of ancient Roman catacombs.
The property once included a hidden 'lover's lane' and various interconnected tunnel networks.
Forestiere Underground Gardens is a subterranean complex hand-carved by Baldassare Forestiere between 1906 and 1946. Spanning 10 acres, the site features a series of courtyards, grottos, and passages located beneath the surface of Fresno, California. The design utilizes Mediterranean-style architecture, including archways, stone walls, and skylights, to allow natural light to penetrate the underground rooms. Forestiere, an immigrant from Sicily, built the space to escape the extreme heat of the Central Valley summers. The gardens incorporate active cultivation, featuring various fruit trees such as citrus, fig, and grapevines that grow from the sunken floor levels. The construction relies on gravity-fed irrigation and clever ventilation systems. The site is listed on the National Register of Historic Places and serves as a California Historical Landmark. Visitors explore the site primarily through guided walking tours that explain the hand-tool excavation process.
The main courtyard area where the overhead archways frame the sunlight, creating high-contrast lighting against the stone walls.
Wear comfortable, flat, closed-toe walking shoes as the ground consists of packed earth and uneven stone.
Book reservations online in advance, as tours are strictly guided and have limited capacity.
Bring a light sweater or jacket if visiting during early spring or fall, as the subterranean air remains cool.
Do not attempt to arrive without a pre-booked reservation, as walk-ins are rarely accommodated due to tour-group limits.
Closed on Mondays and Tuesdays year-round; open seasonally with reduced availability in the winter months.
Do not touch the stone walls or vegetation; stay with your guided tour group at all times; no food or drink allowed inside the tunnels.
