Latvia nestled between Estonia and Lithuania this northern.With a population of under 2 million, its under-recognized situation works to its advantage, making it by far the most populous country in Europe and also far from the most expensive.
Turkey probably isn't the first European destination that comes to mind just because it's not a European country, but it's not Constantinople. Istanbul has a long and storied European history and Turkey continues to be an incredible tourist destination despite its classic woes.
Bordering Italy and Austria one can imagine how a small country like Slovenia might fall through the cracks while those with cash to burn will likely be drawn to its flashier neighbors penny squeezing tourists won't at all feel like they're settling for less appeal
Czechia bordering poland you'll find the nation formerly known as the Czech Republic a country overflowing with world heritage sites this includes the historic centre of prague which provides a gateway to other wonders like saint vitus cathedral and charles bridge while the sightseeing is technically.