Do I need to reinvest in tax saving bonds (Sec 54) after they mature or can I invest anywhere I want?

Based on your answers I understand that if I invest the long term capital gains amount after selling house property, I have to pay tax only on the interest received on the long term capital gains tax saving bonds (Sec 54). After the bonds mature is it essential to invest in similar bonds or can I invest in other investment options like shares, mutual funds etc.?