Dublin
Dublin is one of the best destinations in Europe when traveling solo. It was once settled by interloping Vikings and today it is renowned for its magnificent museums and (literally) pubs with live traditional music. The city has a fascinating history and a rich culture that are worth exploring, and it is best to do it on your solo journey. You can also go to the Guinness Storehouse, which is like a beer lover's Disneyland and will bring out the (alcohol-fueled) child in you. Another fantastic day trip destination is Kilmainham Gaol, a wonderfully preserved old prison.
Sweney's Pharmacy, referenced in James Joyce's Ulysses, and the Dublin Writers Museum are a few of the must-see locations (this small cultural space gives a glimpse into the world of the writers who once inhabited the city). If you're "not a museum person," it's best to just explore the city and take in all the attractions that have inspired so many famous novels and writers in centuries gone by.
Location: Dublin, Ireland