More than 12 years since the fall of the World Trade Center in New York City, the National September 11 Memorial & Museum is finally set to open its doors.

After an opening ceremony led by President Barack Obama on May 15, the 9/11 Memorial Museum will open its doors to the public next Wednesday in lower Manhattan, giving visitors a close look at artifacts and stories from the Sept. 11, 2001, terrorist attack that left the twin World Trade towers in ruins and more than 2,700 dead.

Occupying 110,000 square feet of space, the 9/11 Memorial Museum will take visitors seven stories underground below the twin memorial pools. Along the way, visitors will see several remnants of the original World Trade Center structure, including the “Survivors’ Stairs,” parts of the original foundation, and remnants of the “tridents” that lined the outer shell of the Twin Towers.

In addition to the structural remnants at the Memorial Museum, many other artifacts will be on display for visitors, including the remains of a ladder truck from New York City Fire Department Ladder Company Three.

While the museum gets its name from the attacks on the World Trade Center and the Pentagon, it also explores other events related or leading to the 9/11 attacks, including the 1993 World Trade Center bombing.

The total cost of the museum and the accompanying 9/11 memorial was $700 million, which came from private donations and grants, according to USA Today.

According to the memorial’s website, visitors to the 9/11 Memorial & Museum can expect to pay up to $24 for admission. However, the museum also offers free admission on Tuesday evenings.

Take a closer look at the 9/11 Memorial Museum in photos below.