AR technology has been rapidly accepted in the cultural heritage domain, which requires wide context information for complete understanding as providing an enhanced experience to the user with related information of the physical world. However, currently, there are several limitations for seamless AR such as applications in outdoor environments and wearable platforms. To address this issue, we introduce our AR platform in this paper that supports the outdoor AR and wearable platform. Through the standardized metadata schema-based data retrieval, time-space correlated AR content containing the assorted context information can be provided to users. In addition, vision- and sensor-based spatial data composition technology supports stable 3D outdoor tracking. Finally, an immersive visualization provisioning module, which integrates the aforementioned component, provides a 360-degree panorama virtual reality for wearable platforms and the outdoor AR in mobile platforms. Using this platform, we expect a seamless context-aware AR service in the cultural heritage domain.