The main reasons were, America's support the ongoing struggle by Cubans and Filipinos against Spanish rule, and the mysterious explosion of the battleship U.S.S. Maine in Havana Harbor.
Search it on history.com i got all my information from there because i had a book report.
The Colosseum.
The Pantheon.
The Baths of Carcalla.
The Arc of Constantine.
Circus Maximus.
The Tower of Hurcules.
The Pyramid of Cestius.
The Arena of Nimes.
The Baths of Trajan.
Porta Nigra.
