Old Serakhs (VI c. B.C. - XIX c. A.D.), one of the largest archaeological monuments of Southern Turkmenistan, is an urban site located at the upper reaches of the Tejen river near Serakhs.

Serakhs was the center of a rich oasis and trade junction between Merw and Nishapur, with a citadel surrounded by a walled shakhristan and a vast rabat. Within the shakhristan is the mausoleum of Abul-Fazl (Serakhs Baba), constructed in 1024, a masterpiece of the Serakhs architectural school.