Anuradhapura was the centre of Theravada Buddhism and its towering dagobas - massive dome-shaped reliquary monuments that dwarf even ancient Rome's grandest structures - rise above the plains in a spectacle of spiritual devotion. The Sri Maha Bodhi tree, grown from a cutting of the tree under which the Buddha attained enlightenment, is considered among the most sacred sites in the Buddhist world.

Yapahuwa was a short-lived medieval capital of Sri Lanka built atop a massive rocky outcrop surrounded by jungle. Its most striking feature is the ornate carved staircase leading to the upper palace - an architectural delicacy that rivals anything found in the more famous sites of the Cultural Triangle. Yapahuwa sees relatively few tourists, offering an atmosphere of peaceful discovery for those who seek out the road less travelled.

Dambulla Cave Temple is the best-preserved cave temple complex in Sri Lanka, comprising five separate caves filled with over 150 Buddha statues and ceiling murals dating back 2,000 years. The caves have been a place of Buddhist worship since the 1st century BC and an active place of pilgrimage today. A guided storytelling session within the caves brings the intricate iconography and historical narratives to life.

Built in the 5th century by King Kashyapa as a palace and a fortress, Sigiriya features frescoes of celestial maidens painted onto the sheer rock face, a pair of lion paws carved at the summit entrance, and the remnants of sophisticated water gardens at its base. Climbing to the summit to witness the panoramic view across the Sri Lankan plains is an experience that resonates long after the journey.

Polonnaruwa is a UNESCO World Heritage site that once served as a powerful empire. Its ancient ruins include the Gal Vihara - a series of colossal Buddha images carved from a single granite outcrop - as well as royal palaces, bathing pools, irrigation tanks and archways that speak of a civilisation far ahead of its time. Exploring the site by bicycle is one of Sri Lanka's most magical experiences.