How to prevent open last projects when IntelliJ IDEA starts?

Question

By default IntelliJ IDEA opens the last project when starting.

How to start IntelliJ without opening last project?

Answer 1

For Intellij 13 on Mac 10.9 (Mavericks), it is located at ~/Library/Preferences/IntelliJIdea13/options/ide.general.xml as well. ( I don't have enough reputation to vote up Nicholas' answer ).