The crowds of Christian pilgrims are especially large because for the first time in years, the Eastern Orthodox and Western Churches are marking Easter - the day Christians celebrate the resurrection of Jesus - at the same time.

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John's Church was based on the Gospel of John and the resurrection of Jesus.

NPR: Obama Hears Easter Service With Political Theme

On Sunday, my family will join other Christians all over the world in marking the resurrection of Jesus Christ.

WHITEHOUSE: Weekly Address: Holiday Greetings

And this weekend, Michelle, Malia, Sasha and I will join Christians around the world to celebrate the Resurrection of Jesus Christ and the hopeful promise of Easter.

WHITEHOUSE: Weekly Address: President Obama Offers Easter and Passover Greetings | The White House