Donegal Castle is a fascinating 15th-century castle with a later Jacobean wing. Built by the--almost legendary--historical figure Red Hugh O'Donnell in 1474, this castle was one of the strongest fortresses in Ireland. When the O'Donnell clan fled in 1607 (a period known as "The Flight of the Earls"), the castle came under British control and a Jacobean wing was added. Today, the castle has been almost fully restored and is the site of regular Gaelic culture events.

Lovćen National Park is about a 45-minute drive from Tivat, and honestly, the drive itself is half the fun. The winding roads take you through some jaw-dropping scenery, so don’t rush it. Once you’re there, the park has it all—mountain views, thick forests, and plenty of trails if you’re up for a hike. At the top, you’ll find the Njegoš Mausoleum, a monumental tribute to Montenegro’s famous poet and ruler, Petar II Petrović Njegoš. From up there, you'll also get some of the best views around, stretching out over the Bay of Kotor.

Unique in Greece, the Rotunda is a cylindrical building from the early 4th century AD. The mosaics inside are really impressive. The Rotunda is a massive circular structure, built in 306 AD, with a masonry core. Through its long history, it has gone through multiple periods of use and modification as a polytheist temple, a Christian basilica, a Muslim mosque, and a Christian church once again. A minaret is preserved from its use as a mosque, and ancient remains are exposed on its southern side. Some Greek publications claim it is the oldest Christian church in the world. These days, the Rotunda is primarily an archaeological site, where you can see some remaining Christian mosaics and feel the weight of history.