The Caves of Frasassi, in the middle of the region near Arcevia, are a true geological wonderland. The extensive network of caverns stretches for eight miles. Because they were only discovered in 1971, they are in excellent condition, without too much outside intervention or damage. In fact, to enter Frasassi, you’ll need to pass through three sets of vault-like doors that keep the caves at a precise climate to maintain its natural state.

Once inside, the guide will lead you through stalagmite-lined passageways and into vast chambers like the Ancona Abyss, which is so enormous the Milan Cathedral could easily fit inside of it. You’ll pass other-worldly geological formations, like "Niagara Falls," a stalgmite of calcite that resembles cascading water; a crevice called the Grand Canyon, and the Organ Pipes, a series of stalactite formations that resembles the church instrument and makes varying tones when lightly tapped. The Giant, the Castle of the Witches, and the Crystal Lake are other awesome formations inside the depths of the cavern.

For more advanced spelunkers there are other tour options available that delve deeper into the cave system, lasting two hours or three hours respectively. They must be reserved in advanced, at a cost of €35 or €45 per person.

Regular tourist visits last just over an hour and cost €15.50 (€12 for kids). English language visits are offered four times a day: 11:15 AM, 12:45 PM, 2:45 PM and 4:15 PM from March through October. In winter, you'll want to reserve an English guide in advance. (If you're capable in Italian, tours are much more frequent.)

Frasassi Caverns are located outside the hamlet of Genga, near the pretty town of Arcevia.

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