Czechia are currently the only only non-host nation side to have knocked out a host nation having beaten Netherlands in previous round.
Ranked 40th in the World in FIFA's pre-tournament rankings Czechia are the lowest ranked team left in the competition, though this will surely change after the tournament. Ukraine in 24th and Denmark in 10th are the closest to them as we move up the list.
If Czechia make the final they'll have played in four different nations to get there which is the same as Spain and Denmark in the eventuality either of those teams make it. Italy will have played in three, England in just two but Ukraine will have travelled to five different nations over course of the tournament.