Apart from the war-ravaged Đồng Đăng Border town, which has a rich war history that attracts many visitors, the other historical places of interest in the province are two large limestone caves located a short distance from Lạng Sơn town, and a 16th-century citadel of the Ming dynasty.

The two caves contain Buddhist altars, are well illuminated and are called the Tam Thanh Cave and the Nhi Thanh Cave.
The Tam Thanh Cave is very large with three chambers, a water pond,  and has a window opening which provides scenic views of vast rice fields outside.
The outer chamber of the cave on the right contains the Tam Giao Pagoda (built in 1777) with six shrines.
 The second chamber of the cave on the left also has shrines.
The Ngoc Tuyen River flows through this cave into the mountain, an unusual feature which is described as "a dramatic sight."
The Nhi Thanh Cave, about 700 m away from and Tam Thanh Cave, were discovered in the 18th century by Ngô Thin Sy, a military commander at the Lạng Sơn garrison.
His poems have been inscribed at the entrance to the cave.
A plaque erected near the cave depicts a French resident of Lạng Sơn in full European dress.
The Ngoc Tuyen River flows through the cave.

The Ming dynasty Citadel, a 16th-century monument located in a desolate area on a rock outcrop, is bounded by the east-west facing walls and can be accessed using the Tam Tinh road from Lạng Sơn city.
A series of steps from the roadside lead to the ruins of the citadel.

Lạng Sơn city also has ancient walls built in the 18th century.
Apart from the war-ravaged Đồng Đăng Border town, which has a rich war history that attracts many visitors, the other historical places of interest in the province are two large limestone caves located a short distance from Lạng Sơn town, and a 16th-century citadel of the Ming dynasty.
The two caves contain Buddhist altars, are well illuminated and are called the Tam Thanh Cave and the Nhi Thanh Cave. The Tam Thanh Cave is very large with three chambers, a water pond,  and has a window opening which provides scenic views of vast rice fields outside. The outer chamber of the cave on the right contains the Tam Giao Pagoda (built in 1777) with six shrines.  The second chamber of the cave on the left also has shrines. The Ngoc Tuyen River flows through this cave into the mountain, an unusual feature which is described as "a dramatic sight." The Nhi Thanh Cave, about 700 m away from and Tam Thanh Cave, were discovered in the 18th century by Ngô Thin Sy, a military commander at the Lạng Sơn garrison. His poems have been inscribed at the entrance to the cave. A plaque erected near the cave depicts a French resident of Lạng Sơn in full European dress. The Ngoc Tuyen River flows through the cave.
The Ming dynasty Citadel, a 16th-century monument located in a desolate area on a rock outcrop, is bounded by the east-west facing walls and can be accessed using the Tam Tinh road from Lạng Sơn city. A series of steps from the roadside lead to the ruins of the citadel.
Lạng Sơn city also has ancient walls built in the 18th century.
Lạng Sơn Province