Preah Ko holds the distinction of being the inaugural temple constructed in the ancient city of Hariharalaya, now located in the Roluos region, approximately 15 kilometers southeast of the principal temple complex at Angkor, Siem Reap province, the Kingdom of Cambodia. This temple was commissioned in the late 9th century by Khmer King Indravarman I, with the intention of honoring the king's family members and establishing their connection to the Hindu deity Shiva.

Bakong is recognized as the first sandstone temple mountain constructed by the ruler of the Khmer Empire. Situated near present-day Siem Reap in Cambodia, it served as the official state temple for King Indravarman I during the latter part of the 9th century AD. This significant structure is located in the ancient city of Hariharalaya, an area known today as Roluos.

Lolei is recognized as the northernmost temple within the Roluos group, a collection of three late 9th century Hindu temples located in Angkor, Siem Reap province, the Kingdom of Cambodia. The other two temples in this group are Preah Ko and Bakong. Constructed as part of the thrivingly ancient city of Hariharalaya, Lolei was the last of the three temples to be built. On July 8, 893, King Yasovarman I, who ruled from 889 to 910, dedicated the temple to Shiva and the royal family. The name "Lolei" is believed to be a modern corruption of the ancient name "Hariharalaya," translating to "the city of Harihara." Originally designated as "Ishvaraloka," meaning "the Realm of the Supreme God," the name change occurred after the decline of the Khmer Empire, which lasted from 802 until 1431 AD.

Beng Mealea Temple, meaning the temple of Lotus Pond, or Boeng Mealea is a temple from Angkor Wat period, located 77 km from Siem Reap by road. This temple was built as a Hindu temple to dedicate to God Vishnu by King Suriyavaraman II completed in the early 12th century. Notably, this temple was added to the UNESCO World Heritage Tentative List on March 27, 2020, in the Cultural category.

Banteay Srei, commonly known as the “Citadel of Women” or the “Citadel of Beauty,” is a remarkable 10th-century temple in Cambodia dedicated to the Hindu deity Shiva. Situated approximately 25 kilometers northeast of the famed Angkor temple complex, near Phnom Dei, Banteay Srei is distinguished by its exquisite carvings and the unique use of pink sandstone in its construction. The temple was consecrated on April 22, 967 CE, and is notable within the context of Angkorian architecture for its origins; it was not commissioned by royalty. Instead, Banteay Srei was constructed by two courtiers, Yajnavaraha and Vishnukumara, who served as counselors to King Rajendravarman II. This aspect underscores the significant role and influence of non-royal patrons within ancient Khmer society, marking Banteay Srei as a notable landmark in both historical and cultural terms.

Banteay Samré, known as the “Citadel of the Samré,” is a remarkable temple nestled in Angkor, Cambodia, just about 400 meters east of East Baray. Erected during the reigns of Suryavarman II and Yasovarman II in the early 12th century, this temple beautifully showcases the Hindu architectural style that is emblematic of Angkor Wat. Its name pays homage to the ancient Samré people who inhabited Indochina. Featuring a striking single ogival tower, the temple exemplifies the classic characteristics of Angkor Wat design. The layout and aesthetics are reminiscent of other significant temples nearby, including Thommanon and Chau Say Tevoda. Between 1936 and 1944, Banteay Samré was meticulously restored by the talented Maurice Glaize, ensuring its beauty and history are preserved for generations to come.

Phnom Bakheng, a hill of Bakheng, serves as a significant temple mountain located in Siem Reap Province of the Kingdom of Cambodia. Constructed during the late 9th to early 10th centuries under the reign of King Yasovarman I, who ruled from 889 to 910, this Hindu temple is dedicated to the deity Shiva. Notably, Bakheng temple predates Angkor Wat by over 200 years and once functioned as the principal temple within the Angkor region. It was a central architectural feature of a new capital called Yasodharapura, the City that Bestows Glory, established by a Khmer king Yasovarman I when relocating the court from the earlier capital, Hariharalaya, situated approximately 13 km to the southeast of modern-day Siem Reap. The Phnom Bakheng temple is not only a cultural treasure but also a premier destination for those wishing to witness the breathtaking Angkor sunsets.