There's something strange yet compelling about seeing vaults and crypts. If this sounds interesting to you, stop at King Sidabutars Tomb.
Situated in Samosir, this tomb site is worth including in your schedule. But you'll find lots more to check out in the area. Tomb of the Sidabutar Kings, Museum Huta Bolon Simanindo, and King Siallagan's Stone Chair aren't too far away from King Sidabutar's Tomb.