18 towers visited by Marta-Elena Palacio

Belem Tower

Big Ben

Burj Al Arab

Burj Khalifa

Canton Tower

CN Tower

Dancing House

Eiffel Tower

Empire State Building

Fernsehturm Berlin

Flatiron Building

Galata Tower

Montparnasse

One World Trade Center

Ostankino Tower

Prague Astronomical Clock

Taipei 101 Observatory

Tower of Pisa