On the to Brastagi from Parapat, there is a complex of Rumah Bolon, or the long house used as the palace by Batak Simalungun. The architecture is amazing, imagine the wooden house is standing still with using a nail. Major coloures used are yellow, black, white and red. These coloures might be pride of Batak in Northern Sumatera.
Heading to Brastagi, you may feel the breeze, as the air goes chiller. Make a stop to see the very nice of Sipiso-piso waterfall, from here you less than an hour to reach Brastagi.