The constructed version of the Vatican has been built by Revd Bob Simon from Pennsylvania.
Revd Simon serves as a pastor at St. Catherine of Siena church in Moscow, Pennsylvania, and has visited the real Vatican five times.
The piece is on display at The Franklin Institute in Philadelphia and shows the whole of St Peter's Square, including the Basilica.
The mini Vatican is made of more than half a million Lego bricks.
Larry Dubinski, president of the Franklin Institute, speaking in The Washington Post said: "It's amazing.
"People are in awe."
Revd Bob Simon has spent about 10 months building it and the creation even features a mini Lego Pope overlooking crowds as he stands on a balcony.
More than 44,000 Lego pieces make the cobblestones.
The square of on-lookers is full of colour Lego characters, including a nun with a selfie stick.
#American #Catholic priest made 4,3x2m copy of #Vatican from #lego. Here u'll see nuns, guards, doves & even the Pope pic.twitter.com/UbnK7VDmW7
— Jamilia (@JamiliaBailey) September 13, 2015The whole piece measures around 14 feet by 6 feet and weighs about 100 pounds.
Revd Simon said: "It was daunting.
"It was an exercise in patience, and I was thrilled with the way everything came out."
He used the image from a book cover as a rough guide and said that the hardest part was crafting the round basilica dome from square bricks.
"I'm also not really great at math.
"so I was daunted by that as well," he added.
Revd Simon finished the piece in time for a Lego convention in Northern Virginia where it was highly awarded.
His creation is now available to view at "The Art of the Brick," an exhibit of Lego sculptures, and "Vatican Splendors," which features Vatican art, ceremonial clothing and religious items.
Revd Simon is hoping to attend the Philadelphia papal Mass on Sunday.
The Lego Vatican is quite impressive in person! @TheFranklin #WMOF2015 pic.twitter.com/fbENxg3Ibs
— USCCB Marriage (@MUR_USCCB) September 23, 2015