Monuments

Odawara Castle

Odawara Castle — history, architecture and visitor guide

Offa's Dyke

Offa's Dyke — early medieval earthwork along the England–Wales border

Okayama Castle

Okayama Castle — the 'Crow Castle' of Okayama

Old Melbourne Gaol

Old Melbourne Gaol — history, design, notable events and museum

Old North Church

Old North Church (Christ Church in the City of Boston)

Old St Paul's Cathedral

Old St Paul’s Cathedral — the medieval cathedral of the City of London

Old Synagogue (Erfurt)

Old Synagogue (Erfurt) — medieval Jewish site and museum

One World Trade Center

Operation Boatswain Memorial

Operation Boatswain Memorial — Mount Herzl, Jerusalem

Oriental Pearl Tower

Orlov diamond

Osaka Castle

Osaka Castle: history, architecture, and cultural significance

Osborne House

Osborne House: Victorian Royal Residence on the Isle of Wight

Osborne's bull

Osborne's Bull: Spain's Iconic Roadside Silhouette

Our Lady of Meritxell

Palace of Caserta

Palace of Caserta (Reggia di Caserta)

Palace of Versailles

Palace of Versailles (Château de Versailles)

Palace of Whitehall

Palaestra at Olympia

Palaestra at Olympia: architecture, use, and historical context

Palais Bourbon

Palazzo Carignano

Panteón Francés

Pantheon

Pantheon (Rome): ancient temple, dome, and architectural legacy

The Pantheon in Rome is a remarkably preserved ancient temple rebuilt under Hadrian, famed for its unreinforced concrete dome, oculus, continuous use, and wide influence on Western

Papahānaumokuākea Marine National Monument

Parthenon

Parthenon: Ancient Temple on the Athenian Acropolis

Pashupatinath Temple

Passage tomb

Pentre Ifan

Pentre Ifan: Neolithic Dolmen of Pembrokeshire

Persepolis

Petronas Towers

Peyrepertuse Castle

Peyrepertuse Castle — perched Cathar fortress in Aude, Occitanie

Pickford's House Museum

Pickford's House Museum — Georgian house and costume museum in Derby

Plaza Mayor of Madrid

Poblet Monastery

Poblet Monastery — Royal Abbey of Santa Maria de Poblet

Poets' Corner

Poets' Corner at Westminster Abbey: Commemoration of British Writers

Pont du Gard

Pont du Gard: Roman aqueduct bridge in southern France

Poughkeepsie Bridge

Poughkeepsie Bridge (Walkway Over the Hudson)

Powersite Dam

Prytaneion

Puerta de Alcalá

Puthia Temple Complex

Pyramid

Pyramid: forms, history, and cultural significance

Pyramid of the Sun

Pyre

Quai Branly Museum

Queen's Hall

Quirinal Palace

Quirinal Palace (Palazzo del Quirinale)

Raigad Fort