Should you be interested in something else other than that above, there is a town connected to Napoleonic history nearby , if you opt for the rental car, the town of Brienne-le-Chateau..
The town located ca. 42 KM (ca. 26 miles) from Troyes in a northeastward direction is steeped in the history of Napoleon. It's where he went to military school amidst all those from the nobility. The town markets itself on this connection.
The town is also where the Allies (Russians and Prussians) in the invasion of France first tangled with Napoleon, they got beat. That military school building is now the Napoleon museum, was expanded in the last few years prior to the pandemic. I don't know if the Brienne can be reached by public transport.