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A picturesque old stone bridge in a remote location among the hills, though it's not actually Roman - it was built in the Ottoman era, sometime between the 16th and early 19th centuries. Reaching the village of Stevrek requires driving (or cycling) on a paved, but sometimes potholed country road; then, you have to hike to the bridge unless you have a high-clearance 4WD vehicle. To get to Stevrek from Targovishte/Omurtag: Road 408 branches off E772 30 km west of Targovishte (8 km west of Omurtag) - look for a bridge junction with signs to Kamburovo and (408) Stara reka, get off E772 there and follow 408 to the south (Kamburovo is in the opposite direction). Follow the 408 for 24 km to the south-west, passing through Iliyno ('Илийно') and a number of other villages until you reach Stevrek ('Стеврек'). Your next challenge is finding the start of the Stara Reka eco-trail, because it's poorly marked - it's close to the bridge where the 408 crosses Stara Reka (the same river the old bridge is on), on the eastern side; look for a paved road starting on the north side of the street, leading uphill; there's a large faded white sign with the EU flag, and smaller, hard to notice yellow sign "Eco Trail Roman Bridge". The path is not on OpenStreetMap, but BGMountains.org has it (online map zoomed on the trail; downloadable maps for Garmin with Latin place names).
© OpenStreetMap contributors
Small historic and ethnographic museum, proportional to the wealth and size of Omurtag. Renovated one-floor National Revival building (the year on the facade is 1876). The most notable exhibit is the flown spacesuit of Aleksander Aleksandrov. Entrance through the yard door. A visit may require contacting the curator by phone, and it's likely that they don't speak English.
A 5 m bronze depiction of a cosmonaut in a spacesuit, in an amusingly stylized futuristic style. Surprisingly, it's not from the Communist era - it was erected in 2012. Sculptors Doko Dokov and Dimitar Koychev (both from Kazanlak).
Krumovo kale
One of the 100 National Tourist Sites. Reaching it requires either a car, or using public transport (bus line 4). There's a small parking lot at the base of the hill, next to the bus stop and a restaurant; a dirt road leads to the ruins, and a hiking path (red markings) mostly follows the road, but then continues after the ruins to the Mladost Hut.
Small but well-kept museum in a renovated early 20th century building. Outside, there are a few Soviet artillery guns and a ground sundial. Exhibits include archaeological finds from Kovachevsko Kale (see below), as well as the modern history of Popovo and diverse aspects of urban life in the first half of the 20th century, from schooling and home life to firefighting and the railway.
Борово око
An artificial pond next to a pine park (Borovets Park), hence the name (Pine Eye). The tree-lined alley around it is a pleasant place for a walk during the greener parts of the year. Large fish and water turtles have been introduced in the pond to control vegetation, and people feed them; there's also an inlet full of sonorous frogs. There's a restaurant with an open-air dining area partially overhanging the lake, built in the Communist era (see the Eat section).
Археологическа експозиция
Another former school building (built in 1907). Notable exhibits include a unique Copper Age set of figurines representing a religious scene, the Kralevo gold treasure, and the tools of a Roman surgeon/physician.