One of the first visible projects of the Boii association was a Celtic nature trail opened in 2003. The nearly ten-kilometre loop begins at Nasavrky Castle and winds through the picturesque landscape of the Železné hory Hills, following the Chrudimka valley to Hradiště and back.
The trail introduces visitors to the Celtic history of the region directly in the places where it unfolded. It was gradually extended with additional stops including a circuit at the České Lhotice oppidum, and complemented by the Boika lookout tower. To this day it remains a popular destination for tourists and school trips alike.
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