Once owned by Richard II of England, the castle is the city’s foremost landmark and oldest monument. The structure boasts more than 1,700 years of history and still serves as a military fortress today. Don't miss the Navy Museum inside!

At the Shrine of the Divine Mercy in El Salvador City, you can explore a 15-metre statue of Jesus Christ, which houses a healing chapel and adoration chamber. Enjoy serene gardens, Mary's Rosary Garden, and the Stations of the Cross. The site offers a peaceful atmosphere for reflection and prayer. Dress respectfully, and pick up some religious items from the souvenir shops to remember your visit.

Christmas Island is one of the world's truly spectacular tropical seabird rookeries. It's not just the number and variety of seabirds or their magnificent splendour that make the island so remarkable, but also their sheer visibility. Around 80,000 seabirds nest here annually, with 23 breeding or resident species. Birds can be seen and heard everywhere on the island, at just about any time of the day. With just a little effort, birdwatchers can easily tick off a full list of residents in a busy week or a more relaxed fortnight. However, the elusive Christmas Island hawk owl keeps many coming back. More than 100 vagrant and migratory bird species have been recorded here, including eight breeding seabird species and one subspecies. The most numerous is the wide-ranging red-footed booby, which nests in colonies in trees in many parts of the coastal shore terraces. You may see the endangered Christmas Island frigatebird soaring above Settlement — it's the world's rarest frigatebird and nests only on the island. The golden form of the white-tailed tropic bird is an endemic subspecies unique to Christmas Island. Known locally as the golden bosun bird, this stunning bird is graceful in flight and has been adopted as the island's fauna emblem.

If you could draw an almost perfect Robinson Crusoe style beach, Dolly would definitely be a contender. Natural food supplies, shelter, and a source of fresh water would keep most castaways happy, and this beach has been known to do just that. As you arrive, especially if you are the first person of the day, you may be drawn to the turtle tracks in the sand. You can follow them until you find the signs of a nest. Both hawksbill and green turtles have been spotted. At the northern end of the beach, the hills are marked by fantastic rock formations with plenty of resident seabirds. More interesting, though, are the sea-level rock pools. Waves crash over the golden-toned, stony reef edges, which doesn't discourage marine life. Red algae and small hard corals paint different colours across the surfaces, while small fish dart about between the pools. Tiny moray eels hunt in ankle-deep water, and if you stay still they will swim up to you. The opposing end of the beach has slightly deeper pools to explore. Depending on the tides, these allow safe, shallow swimming. Going over the rocks to the sea isn't advised, as currents can be strong.