koblenz, germany - 04 28 2021: sign for rittersturz memorial

tree sign plant trail winter signage forest autumn park woodland nature snow wilderness leaf flower memorial advertising koblenz germany 2021: flood wall rhine city mosel small marks north unesco world heritage mittelrheintal deutsches eck estuary 2000 years history name confluentes roman times writing coblenz centuries rittersturz place german constitution written hotel used rittersturzkonferenz written long gone grundgesetz mosel mittelrheintal centuries