Some 32km up the Esino valley from Jesi, just after the Gola di Rossa, a road leads up from Genga train station to the Frasassi gorge, carved by the River Sentino, which was also responsible for creating the 18km of caves beneath it. The largest of the Grotte di Frasassi, or Frasassi caves, was discovered only in 1971, and just over a kilometre of its caverns and tunnels is now open to the public on tours that last seventy minutes – note that the average temperature inside is 14°C.

Inevitably, the most remarkable stalactite and stalagmite formations have been named: there’s a petrified Niagara Falls, a giant’s head with a wonderfully Roman profile, a cave whose floor is covered with candles complete with holders, and a set of organ pipes. The vast Cave of the Great Wind, at 240m high, is one of the biggest in Europe – large enough to contain Milan Cathedral – and over the years has been used for a series of experiments, ranging from sensory deprivation (as a possible treatment for drug addicts) to a subterranean version of Big Brother.

Book through Rough Guides’ trusted travel partners

Italy features

The latest articles, galleries, quizzes and videos.

Rome in ruins: what to see and what to skip in the eternal city

Rome in ruins: what to see and what to skip in the eternal city

Roman ruins: what to see and what to skip in the eternal city. Not sure which ancient monuments are worth visiting in Rome? Aside from the obvious sites like t…

01 Oct 2018 • Aimee White insert_drive_file Article
13 striking pictures of Venice Carnival

13 striking pictures of Venice Carnival

With the 2018 carnival season about to kick off, Rough Guides author and photographer, Kiki Deere, revisits one of Europe's most colourful festivals: Venice…

25 Jan 2018 • Kiki Deere insert_drive_file Article
20 picturesque Christmas destinations

20 picturesque Christmas destinations

Dreaming of a trip this Christmas? We're here to help. From glittering cities to a few snowy escapes, here are 20 classic destinations for a festive break. …

12 Dec 2017 • Rough Guides Editors camera_alt Gallery
View more featureschevron_right

Privacy Preference Center

Necessary

Mandatory - can not be deselected. Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.

PHPSESSID,aelia_cs_selected_currency,cookie_notice_accepted,RS,bp-message,bp-message-type,id,UIDR,w3tc_logged_out,__cfduid
__cfduid

Statistics

Statistic cookies help website owners to understand how visitors interact with websites by collecting and reporting information anonymously.

__utma,__utmb,__utmc,__utmz,_ga,_gid,__atssc,__atuvc,__atuvs,di,dt,ssc,ssh,sshs,uid,uit,xt
__utma,__utmb,__utmc,__utmz,_ga,_gid
__atssc,__atuvc,__atuvs,di,dt,ssc,ssh,sshs,uid,uit,xtc

Marketing

Marketing cookies are used to track visitors across websites. The intention is to display ads that are relevant and engaging for the individual user and thereby more valuable for publishers and third party advertisers.

__gads,PISID, BEAT, CheckConnection TempCookie703, GALX, GAPS, GoogleAccountsLocale_session, HSID, LSID, LSOSID, NID, PREF, RMME, S, SAPISID, SID, SSID,__utmv, _twitter_sess, auth_token, auth_token_session, external_referer, guest_id, k, lang, original_referer, remember_checked, secure_session, twid, twll,c_user, datr, fr, highContrast, locale, lu, reg_ext_ref, reg_fb_gate, reg_fb_ref, s, wd, xs
__gads,PISID, BEAT, CheckConnection TempCookie703, GALX, GAPS, GoogleAccountsLocale_session, HSID, LSID, LSOSID, NID, PREF, RMME, S, SAPISID, SID, SSID
__utmv, _twitter_sess, auth_token, auth_token_session, external_referer, guest_id, k, lang, original_referer, remember_checked, secure_session, twid, twll
c_user, datr, fr, highContrast, locale, lu, reg_ext_ref, reg_fb_gate, reg_fb_ref, s, wd, xs