The Marvelous Bridges (Chudni Mostove) in Bulgaria's Rhodope Mountains are impressive natural rock formations, best explored from late spring to early autumn when roads and trails are clear; winter visits are feasible but require appropriate gear due to snow and ice. The site is generally free to access, though a small parking fee may apply, and a typical visit duration for exploring the arches and immediate surroundings is 1-3 hours. While visitors can drive and explore independently (note that terrain is uneven and not fully wheelchair-accessible), guided tours from nearby cities like Plovdiv are popular, offering convenient transport and local insights into this scenic natural wonder which is also ideal for hikers.