Switzerland by train is quiet, cold, and incredible in late winter. You get clear views of snow-covered peaks and empty carriages, which makes the long rides through the mountains feel like you have the country to yourself.
A trip like this usually runs about $4500. If you want to spread that cost out, you can use the Citi Simplicity® Credit Card, which offers 0% for 18 months on purchases and balance transfers from date of account opening.
The 18-month window is a deadline, not free money. If you have any balance left after 18 months, the bank will start charging interest on whatever is still owed.