- freeplovdivtour.com blog/asenova_krepost/
- visitplovdiv.com en/node/534There is a parking area at the entrance to the fortress. Asen’s Fortress was declared an architectural monument in Issue 20 of the State Records of 1973.
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- historyview.org library/asens-fortress/With its commanding views of the surrounding countryside, Asen’s Fortress is a popular destination for history buffs and outdoor enthusiasts alike.
- plovdivtravel.wordpress.com 2017/01/22/asens-…Asen’s Fortress is the most interesting and most often visited tourist attraction in the Asenovgrad region.
- http://kalinaborovo.com asens-fortress/?lang=enAsen’s Fortress is a medieval fortress in the Rhodope Mountains, it is located 2-3 km south of Asenovgrad. It is named after the Bulgarian tsar Ivan Asen II.
- routeperfect.com bulgaria/asens-fortressAsen's Fortress. Situated high in the hills with parts dating back to Thracian times, this ancient fortress features a well preserver 12C church.
- welcometomymindtoday.wordpress.com 2017/11/23/🌏-…The Asen’s fortress is one of the 100 National Tourist Sites in Bulgaria and awaits quietly its next visitors. Boring but very useful information
- vrpreservation.org asens-fortress/Later in 1204, the Crusaders under René du Troisoccupied the Asen Fortress, rebuilding it and expanding it.Since so many people occupied the Asen Fortress, it...
- getyourguide.com asen-s-fortress-l121950/Relax on the approximately 30-minute drive from Plovdiv to Asen's Fortress, perched on top of a hill in the beautiful Rhodope Mountains.