During the community meetup 2018 in Bulgaria I managed to visit two locations of the Bulgarian Limes.

Sextaginta fortress

The first location was the Sexaginta fortress in Ruse, where we spent the night. The fortress was turned into a museum, providing information boards and boardwalks for easier access. Only a few foundations are left of the fortress, but still enough to make this a worthwhile visit.

Ancient settlement of Durostorum

The second location was Durostorum, an ancient settlement in Silitra. The town is also home to a second Roman TWHS, the beautifully painted tomb and a good crossing point into Romania. Beeing at the same time a public park, the settlement is freely accessible. The ground structure of several buildings and even parts of the town wall are visible.

These two locations alone have more visible remains than everything I saw in Germany and Austria, so extending the current WHS with the Bulgarian part would for sure be an upgrade.