Takht-i-Bahi is a globally significant world heritage site because of its artistic representation of Greco-Buddhism and deep connection to ancient Korea's cultural heritage. In addition to its cultural and historical significance, the site is at risk of extinction due to human-induced threats, including negligence, unsustainable tourism practices, and natural disasters such as earthquakes, floods, and landslides. In the realm of digital heritage, the most effective way to preserve a cultural heritage site is to digitally reconstruct and maintain it to ensure its easy transmission to future generations and clear representation to a wider audience. In light of this trend, our research team decided to digitally document the site and develop its extended reality (XR) content, enabling digital reconstruction and dissemination. This would allow for an accurate representation and experience of the site in a three-dimensional virtual environment, as well as expand its global audience. We first digitally captured the entire site and then used virtual reality (VR) technology in conjunction with XR content creation to turn the site into a museum's immersive content experience. First, we employed a drone camera to digitally record the entire site. Subsequently, we combined VR technology with XR content creation to transform the Takht-i-Bahi heritage site's digital data into an immersive virtual museum content experience. We hope that this will enable potential visitors to actively engage in a VR environment, providing them with the chance to fully immerse themselves in a realistic experience of time and space travel, with the visual representation accurately portraying real-world scenarios of the Takht-i-Bahi heritage site. The Takht-i-Bahi Heritage Site's virtual museum will effectively overcome the typical challenges faced during physical visits by incorporating XR content creation. The Takht-i-Bahi virtual museum's immersive content experience can lead to sustainable outcomes, such as reducing the number of tourists visiting the physical site and increasing its cultural and historical value on a global scale.